At the end of the film Chris and Lila go to the studio and Chris has his helmet with him when he gets off the bike and starts walking. After he takes hold of Lila's hand the helmet has gone. He also doesn't have it right at the end when they are driving off.
In one scene, Chris sits on the sofa playing guitar. Lila comes to him, puts the guitar on the sofa and starts cuddling with Chris. At first, the guitar changes its position on the sofa without being touched only to disappear from the scene completely a few seconds later.
When the convertible car is being driven by Sister Kate to the concert, one of the car headlights alternates between working and not working.