the error:
ERROR:subliminal.video:Skipping badly encoded directory u'/mnt/data/'
ERROR:subliminal.video:Skipping badly encoded directory u'/mnt/data/watch'
ERROR:subliminal.video:Skipping badly encoded directory u'/mnt/data/.torrent'
ERROR:subliminal.video:Skipping badly encoded directory u'/mnt/data/incomplete'
ERROR:subliminal.video:Skipping badly encoded directory u'/mnt/data/series'
ERROR:subliminal.video:Skipping badly encoded directory u'/mnt/data/series/Arrow'
ERROR:subliminal.video:Skipping badly encoded directory u'/mnt/data/series/Arrow/Season 3'
ERROR:subliminal.video:Skipping badly encoded directory u'/mnt/data/completed'
ERROR:subliminal.video:Skipping badly encoded directory u'/mnt/data/completed/Interstellar.2014.1080p.BluRay.H264.AAC-RARBG'
0 video collected / 0 video ignored / 0 error

my setup:
pi@pi ~ $ cat /etc/issue
Raspbian GNU/Linux 7 \n \l

python:
pi@pi ~ $ python --version
Python 2.7.3

crontab:
SHELL=/bin/bash
LANG=en_US.UTF-8
LANGUAGE=en
LC_CTYPE=en_US.UTF-8
# Edit this file to introduce tasks to be run by cron.
#
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
#
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').#
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
#
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
#
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
#
# For more information see the manual pages of crontab(5) and cron(8)
#
# m h  dom mon dow   command
#* * * * *  sudo -i bash -x -c '/home/pi/subliminal.sh'
* * * * * sudo /usr/local/bin/subliminal --debug download -l nl -s -a 1w -v /mnt/data/ > /tmp/subliminal.log 2>&1