Continuity mistake: When Fred is giving Guy the "comic relief" pep talk, his left hand is on the left side of Guy's chest, but then the view changes to Guy's right side and Fred's left hand is now on the right side of Guy's chest, where it remains until Fred turns Guy and they walk out of the scene.
Continuity mistake: When the 4 "nerds" first approach the captain to talk about their supposed problem the girl is standing in a different place than when they cut back. In a later scene the girl is in this position and I believe they reshot the earlier scene while they were doing the later scene. (00:07:30)
Continuity mistake: During the opening sequence of Alexander storming out of the back rooms, you can see Tommy help keep him there. However within the next shot as they Call Gwen to the stage, you can see Tommy and the whole crew out on stage but Alexander and the Commander are still having the same dialogue. (00:04:10 - 00:05:00)
Continuity mistake: When they're flying down to the planet, Guy is upset because he doesn't have a last name. He asks Jason, "What's my last name?" and Jason doesn't know. In the very next scene, Jason addresses Guy by his last name, Fleegman. (00:55:00)