Goofs

Additional screening is always done by a TSA officer of the same gender.

Miles hides Alvin in his backpack and makes Alvin pretend to be a doll at the airport. He could've had Simon and Theodore do the same.

Unless they made pit stops while driving to Miami and back to Los Angeles, the Chipmunks and Dave wouldn't have been able to take long drives without running low on gas.

Kimberly Williams-Paisley is seen wearing a necklace with a "K" on it throughout the film, despite the fact that her character is named Samantha.