Continuity: Stallone is eating a banana when he is on the computer in the Mariott. He takes a bite and the banana is smaller, then in the next shot it is bigger again.
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Mistakes
Near the end, when the Russian assassin (which "Robert" thought he killed years earlier) comes into the room, he sets the case down, takes off his sunglasses with his left hand and kicks "Miguel" to see if he's dead. Just before the kick, the camera changes angle and we see the sunglasses on the case instead of in the Russian's hand. See more...
Assassins (1995)
Directed by Richard Donner, starring Antonio Banderas, Julianne Moore, Sylvester Stallone (add more)
Assassins mistakes
Continuity: When they're in the car, after collecting the money, Julianne Moore holds up the disk, and we can see she's holding the metal flap open, so we can see the actual disk. Then the camera cuts to the other side, and the cover's closed. Cuts back to the original shot, and the cover's now closed on that side too.
Continuity: Near the end, when the Russian assassin (which "Robert" thought he killed years earlier) comes into the room, he sets the case down, takes off his sunglasses with his left hand and kicks "Miguel" to see if he's dead. Just before the kick, the camera changes angle and we see the sunglasses on the case instead of in the Russian's hand.