Character mistake: When Aubrey is telling the Bellas that they will practice two hours a day, seven days a week, the board behind her states that on Sundays they have the day off. (00:35:05)
Suggested correction: Maybe she changed her mind.
Factual error: In the scene where the Bellas run out of gas, on their way to the second competition, it shows the gas gauge saying "unleaded fuel only." But when the bus runs out of gas it makes the sound that a diesel engine makes, not a regular gas engine.
Suggested correction: It's possible that different vehicles sound different.