Continuity mistake: Right after Alex and Beta have their argument in Alex's Bedroom, Louis wakes up and then pretends to fall back asleep. In the shot (with the door that Alex just used in the background) Louis gets up again and bends over to look at Beta, he's moving towards the camera. However, in the next shot, Beta hasn't moved, and he was looking in the direction of Alex (the opposite side of the bed Louis should have been on).
Audio problem: When Alex and Maggie are going back into space at the end, everyone moves back and they yell goodbye. You can hear Otis say goodbye, but his mouth does not move at all.