Continuity mistake: When the Bellas just got told that they are not allowed to compete any more they walk outside and Beca gets a call. When the camera is zoomed in on her you see her calling and moving a lot. When the camera is focusing on the other Bellas she is standing completely still in the background. When the camera is back on Beca she is moving again. (00:12:50)
Continuity mistake: Before the Bellas' second performance, one of the girls is getting her natural hair braided. When the performance begins, they are completely different braids with added extensions.