Revealing mistake: When Tom Cruise and his girlfriend are visiting his former arch rival and now good friend, his wife calls Tom "Tom", not by his character's name.
Revealing mistake: When Rocky delivers the final uppercut at the end, the punch misses by inches.
Revealing mistake: First visit to the Malibu's house, after Jimmy enters the house, you can see the door being closed magically by itself and reopening on its own. (00:27:30 - 00:28:30)
Revealing mistake: When Lyon's brother is set on fire he's wearing fireproof gloves and hood.