The goof item below may give away important plot points.
When Michael Bluth is voted out of George Michael's dorm room, he walks to the door carrying two suitcases with his left arm, and a satchel with his right. He sets the suitcases down and turns to say one last thing before leaving. The satchel is nowhere in sight. He eventually picks up the two suitcases and leaves. In the very next scene, he is walking through the airport with a suitcase in each hand and the satchel around his shoulder.