Well, I use SickBeard. And sometimes (very often actually) the names are rather screwed up…. So I wrote myself a script, that’ll fix most episode errors (I’ve caught so far …).

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#!/opt/bin/bash

OPTS="$@"

[ "$( cat /etc/distribution 2>/dev/null )" == "OpenELEC" ] && openelec=1 || openelec=0
[ "$( mount | /opt/bin/grep "$( echo $PWD | /opt/bin/sed "s,/tvshows,," )" | awk '{ print $5 }' )" == "cifs" ] && cifs=1 || cifs=0

if [ $openelec -eq 0 -a $cifs -eq 0 ] ; then
        # Fix permissions
        chown -R nobody.users "$PWD"
        /opt/bin/findutils-find "$PWD" -type f ! -perm 0664 -exec chmod 0664 {} \;
        /opt/bin/findutils-find "$PWD" -type d ! -perm 0775 -exec chmod 0775 {} \;
fi

EXTENSIONS=".avi .mp4 .mkv .srt .tbn .nfo .xml -thumb.jpg"

# Needs renaming:
PATTERN="WEB.DL,WEB-DL
Web-Dl,WEB-DL
AVC.AC3,DD5.1.H.264
.AC3.PSIV,-PSIV
DD.5.1,DD5.1
DD5-1,DD5.1
Dd5.1,DD5.1
DD.2.0,DD2.0
WEB-DLAAC2,WEB-DL.AAC2
H.264.DD5.1,DD5.1.H.264
AAC.2.0,AAC2.0
DD5.1.AAC2.0,DD5.1
WEB-DL-pcsyndicate,WEB-DL.DD5.1.H.264-pcsyndicate
x264,H.264
X264,H.264
h264,H.264
H264,H.264
Forever.S0,Forever.2014.S0
H-264,H.264
h.264,H.264
DD5.1-H.264,DD5.1.H.264
.KiNGS,-KiNGS
-KINGS,-KiNGS
.TB,-TB
.BS,-BS
.~DG2~,
.~DG~,
.CtrlHD,-CtrlHD
1x,S01E
.ECI,-ECI
.NFHD,-NFHD
.POD,-POD
\.NTb,\-NTb
.DNR,-DNR
.pcsyndicate,-pcsyndicate
German.DD20.Synced.DL.720p.iTunesHD.AVC,720p.WEB-DL.DD2.0.DL.H.264
-ss,-SS
.Reaperza,-Reaperza
Grey's.Anatomy,Greys.Anatomy
Five-0,Five.0
Hawaii.Five.0.2010\.S0,Hawaii.Five.0.S0
WEBRip,WEB-DL
WEB-DL.H.264.AAC2.0,WEB-DL.AAC2.0.H.264
Hell.On.Wheels,Hell.on.Wheels
Mythbusters,MythBusters
Dont.Trust.The.B----.In.Apartment.23,Dont.Trust.The.B.In.Apartment.23
Dont.Trust.the.Bitch.in.Apartment.23,Dont.Trust.The.B.In.Apartment.23
Dont.Trust.the.B.in.Apartment.23,Dont.Trust.The.B.In.Apartment.23
Rizzoli.&.Isles,Rizzoli.and.Isles
Revolution.2012,Revolution
Orange.Is.The.New.Black,Orange.Is.the.New.Black
Castle.S,Castle.2009.S
/Agents.of.S.H.I.E.L.D.,/Marvels.Agents.Of.S.H.I.E.L.D.
Marvel.Agents.Of.SHIELD,Marvels.Agents.Of.S.H.I.E.L.D.
Marvel.Agents.Of.S.H.I.E.L.D..S,Marvels.Agents.Of.S.H.I.E.L.D.S
Marvel.Agents.Of.S.H.I.E.L.D.S,Marvels.Agents.Of.S.H.I.E.L.D.S
Marvels.Agents.Of.S.H.I.E.L.D..S,Marvels.Agents.Of.S.H.I.E.L.D.S
Marvels.Agents.of.S.H.I.E.L.D.,Marvels.Agents.Of.S.H.I.E.L.D.
Rizzoli.Isles,Rizzoli.and.Isles
The.Bridge.S,The.Bridge.US.S
Last.Man.Standing.US,Last.Man.Standing.2011
The.Americans.S,The.Americans.2013.S
Person.Of.Interest,Person.of.Interest
The.Tomorrow.People.S0,The.Tomorrow.People.US.S0
The.Code.AU,The.Code.2014
How.to.Get.Away.With.Murder,How.To.Get.Away.With.Murder
How.to.Get.Away.with.Murder,How.To.Get.Away.With.Murder
How.To.Get.Away.with.Murder,How.To.Get.Away.With.Murder
Izombie,iZombie
-SiCKBEARD,.720p.WEB-DL.DD5.1.H.264
DL.DD5.1.WEB-DL,WEB-DL.DD5.1.DL
XIII.The.Series.2011,XIII.2011"

FILEEXT="\\.nfo\\.
\\.par2\\."

# Find files containing spaces and rename them according to the scene rules
for ext in $EXTENSIONS; do
        [ "$ext" != ".srt" ] && \
                /opt/bin/find . -name "* *$ext" -type f -exec sh -c '
                        fp="${0%/*}"
                        fn="${0##*/}"
                        fn="$( echo $fn | /opt/bin/sed -e "s,\!,," )"
                        fn="$( echo $fn | /opt/bin/egrep -oi "[A-Z][A-Za-z0-9.-]+.$ext" | sort -u | tail -n1 )"
                        echo "Enforcing naming scheme for $0"
                        mv "$0" "$fp/$fn"
                        read -t 1 line </dev/tty
                ' {} ';'
done

# Build the list of replacements. Do it here, since we need to
# do it only once, and not for each file.
for pat in $PATTERN; do
        set -- `echo $pat | tr , \ `
        REN="$REN -e ""s,$1,$2,g"""
done

for pat in $FILEEXT; do
        REN="$REN -e ""s,${pat},,g"""
done

REN="$REN -e ""s/[()]//g"""

# Main loop starts here. Only handle files with the specified extensions.
for ext in $EXTENSIONS; do
        REGEX="$REGEX|$ext"
done

REGEX="$( echo $REGEX | sed "s,|,," )"
MAIN_REN=$REN

for file in $( /opt/bin/find . -regextype posix-egrep -type f -regex ".*($REGEX)" ! -wholename '*tvshow*' ! -wholename '*season*' ! -wholename '*actors' | sort ); do
        OLD="$file"
        NEW="$file"
        REN="$MAIN_REN"

        if [ "$( echo $file | /opt/bin/egrep "\.(REPACK|REREPACK|PROPER|iNTERNAL|RERIP|REAL)\." )" == "" ] ; then
                if [ "$( echo $file | /opt/bin/grep "720p" )" != "" ] ; then
                        REN="$REN -e ""s/\(.*S[0-9]\+\(E[0-9]\+\)\+\)\+.*\(720p.*\)/\1.\3/"""
                fi

                if [ "$( echo $file | /opt/bin/grep "1080p" )" != "" ] ; then
                        REN="$REN -e ""s/\(.*S[0-9]\+\(E[0-9]\+\)\+\)\+.*\(1080p.*\)/\1.\3/"""
                fi
        fi
        NEW="$( echo $OLD | /opt/bin/sed $REN )"

        if [ ! -z "$NEW" -a "$NEW" != "$OLD" ] ; then
                echo "Enforcing naming scheme for $file"
                mv "$OLD" "$NEW"
        fi
done
[ "$OPTS" = "--force" ] && RESCAN_ALL=1 || RESCAN_ALL=0

IFS="
"

if [ $RESCAN_ALL -eq 1 ] ; then
        FILES="`/opt/bin/grep -rl 'episodedetails' */*/*.nfo 2>/dev/null`"
else
        # Get a list of all NFO files having incorrect information
        FILES="`/opt/bin/egrep -rli '(\(Guest Star\)|\(Writer\))' */*/*.nfo 2>/dev/null`"
fi

for episode in $FILES; do

        # First convert the nfo-file to use linux line-breaks.
        /opt/bin/sed -i 's/^M$//' $episode

        if [ "$( /opt/bin/grep '<director>.*</director>' $episode )" == "" ] ; then
                DIRECTOR_MISSING="$DIRECTOR_MISSING $episode"
        fi

        if [ "$( /opt/bin/grep '<credits>.*</credits>' $episode )" == "" ]; then
                CREDITS_MISSING="$CREDITS_MISSING $episode"
        fi

        if [ "$( /opt/bin/grep '<credits>.*\(Writer\).*</credits>' $episode )" == "" ]; then
                WRITER_MISSING="$WRITER_MISSING $episode"
        fi

        if [ "$( /opt/bin/grep '<credits>.*\&amp;.*</credits>' $episode )" != "" ]; then
                CREDITS_JUNK="$CREDITS_JUNK $episode"
        else
                # see if the file has new-style (multi-line) or old-style (single-line) credits.

                if [ "$( /opt/bin/grep '<credits>' $episode | wc -l )" -gt 1 ] ; then
                        echo "Updating episode information in $episode (new-style)"
                        mv $episode $episode.old
                        /opt/bin/grep -v "(Guest Star)</credits>" $episode.old | /opt/bin/sed \
                                -e "s, (Writer),,g" -e -e "s,|, / ,g" \
                                -e "s,  , ,g" -e 's/^[ \t]*//' | \
                                tee $episode &>/dev/null
                else
                        # Mangle the list, so we can work with it

                        old_credits="$( /opt/bin/grep "<credits>" $episode | /opt/bin/sed -n \
                                -e 's/.*<credits>\(.*\)<\/credits>.*/\1/p' )"

                        # Fixup the credits line
                        new_credits="$( echo $old_credits | tr '/' '\n' | /opt/bin/grep -v "Guest Star" | \
                                tr '\n' '/' | /opt/bin/sed -e "s, (Writer),,g" \
                                -e "s,|, / ,g" -e "s,  , ,g" | /opt/bin/sed -e 's/^[ \t]*//' \
                                -e "s/\/*$//" )"

                        shopt -q -s extglob
                        echo "Updating episode information in $episode (old-style)"
                        if [ -n "$new_credits" ] ; then
                                /opt/bin/sed -i "s|${old_credits##+([[:space:]])}|$new_credits|g" $episode
                        fi
                        shopt -q -u extglob
                fi
        fi
done

IFS=" "
if [ -n "$DIRECTOR_MISSING" ] ; then
        echo "The following episodes are missing a director:"
        for episode in $DIRECTOR_MISSING; do
                echo " $episode"
        done
        echo
fi

if [ -n "$CREDITS_JUNK" ] ; then
        echo "The following episodes credits' contain junk and should be fixed at thetvdb.com:"
        for episode in $CREDITS_JUNK; do
                echo " $episode"
        done
        echo
fi

if [ -n "$CREDITS_MISSING" ] ; then
        echo "The following episodes are missing credits:"
        for episode in $CREDITS_MISSING; do
                echo " $episode"
        done
        echo
fi

if [ -n "$WRITER_MISSING" ] ; then
        echo "The following episodes are missing a writer:"
        for episode in $WRITER_MISSING; do
                echo " $episode"
        done
fi

/opt/bin/findutils-find . -name "*.old" -exec rm {} \;

Bear in mind, this script is using ipkg/optware executables, mainly because the provided BusyBox ones are lacking some features.