Continuity: In one scene, Tom Hanks leaves a room while the last part of "Something Isn't Right" by Oingo Boingo is playing. When he reenters the room, the middle of the song is playing.

Other: In the beginning of the movie, when the mechanic is working on the car on the lift, he says he has to change the oil in it, the chassis drops to the ground, there is no engine attached to the chassis or body.

Visible crew/equipment: A short scene opens with an alternate couple in an opposing hotel suite to the one the bachelor party is in full swing at. The guy relaxes the woman by telling her he is just going to open the window for some fresh air, and as he walks to that window and is about to open it, the boom mike can be seen. This appears on the Australian VHS release of this movie.

Revealing: In the scene when miss Desiree is dancing at the party, Rudy takes a deep drink from a bottle of whiskey or brandy or whatever it is. Most of us would appreciate this performance with a liquor. We even see bubbles come up, but as he takes the bottle away from his mouth, he is holding it still upside down. Doing this normally, the content would be spilled on his face, so he probably didn't drink at all.

Deliberate "mistake": The car Rudy, the mechanic, is working on is a 1971-72 Plymouth (the one where the chassis falls down around him). Plymouth's of that era were unibodies, which means that the body and the chassis were all one piece and not separate, so there's no way a chassis could have fallen down like that from that particular car, since it didn't have a separate chassis.

Continuity: In the fight scene at the end with Rick & Cole in the theater, the couple in the front row are slouched down in their seats throughout the fight. Right before the woman gets hit in the face, the couple are sitting up and the guy has his arm around the woman.

Revealing: When the Hotel manager walks in the recently vacated room, we see the piano collapse. If you look closely, you can tell that the front two legs were just pulled back under the piano causing it to collapse.