Lost River

Matt Smith filmed his scenes during his break away from playing The Doctor on Doctor Who (2005). He had to shave his head for the role of Bully and wore a wig for the last episodes of Doctor Who, which were filmed later on.

When Bully is under water after the car wreck he is upside down. The heels of his feet are on the car's hood and his head is under water. Yet when he exhales the bubbles go down when they leave his mouth. They should rise.

There is a short scene after the credits in which the street lights switch off again.

In Germany, Tiberious Film released a double disc Limited Edition Blu-ray set which includes an Extended Version on the second disc, which expands the run-time by approximately 10 minutes (it is also entitled the "Director's Cut" on the cover art). It includes a more extended introduction in which Franky explores the neighborhood whilst Billy frantically searches for him, there are more scenes with Bones and Franky spending time together, a scene with Bones chatting to some local girls, a conversation between Bones and Billy about whether she would find him attractive if he came to her club, various small additional scenes, and the footage from 1961's A Touch of Magic that Bones and Rat watch together features its original soundtrack rather than Zane Ashton's 'He Was a Mean Dragon' (aka. 'The Dragon') as in the theatrical cut. This was apparently the original cut screened at Cannes in 2014 before being re-cut for theatrical release.