Continuity mistake: After Gerry gets smacked in the face by the 'broken' suspender clasp, we see the silver clasp land under the dresser. Yet, when he's moaning and lifting his leg to get onto the bed, we can actually see the clasp still intact on the front suspender that came loose, which is dangling right behind him (just look between his legs). Of course, in the next shot, that clasp is gone. Since the silver clasp is one of the plot points, this is bizarre to say the least.
Continuity mistake: In Ireland, Holly and William are drinking in the kitchen. Between shots, the amount of liquid in Holly's glass changes.
Continuity mistake: When Holly and Daniel are in the small room at the back with alcohol, Daniel's hair continuously changes between shots.