This slip-up is seen in the scene where Buddy(Charlie Sheen) has his father, Gecco, and the other rep's from the airline are having a meeting at Bud's house. At the point where Gecco starts to talk about what he can do for the airline, notice his shoes. Initially he is wearing a pair of white tennis shoes(strange with a suit, but maybe he wanted to be comfortable at an "after hours" meeting), but as the camera goes off of him briefly and then back to him, he has a pair of black dress shoes on. Then, once again, the camera goes away and back to him, as he sits down, he has on the tennis shoes again! This is pretty easy to spot if you focus on his shoes, which the editing crew clearly neglected to do!