Revealing mistake: The kid in the wheelchair is playing a Game Gear with no game in it.
Revealing mistake: In one scene, after a massive car chase, the end result is a city bus twirling round and round. Look under the bus and you can clearly see the mechanism supporting it.
Revealing mistake: Jackie Chan picks up a little girl out of the path of the on-coming hovercraft and throws her to her mother. He clearly throws a doll.
Revealing mistake: When Keung hits the mobster in the face with the football helmet, you can see his bruise appear a split second prior to contact. You can see it better in slow-mo.
Revealing mistake: When Keung meets the gang the first time he throws one of them into a pile of Pepsi cans in the grocery store. You can see that the cans are empty. So why were they piled up?
Revealing mistake: When the hover craft throws the bad guy into the tree on the golf course, you can plainly see the wire helping him to swing into it.
Revealing mistake: Although set in the Bronx, trolleybuses of BC Transit, Vancouver are seen passing in the background.
Revealing mistake: When Jackie is water skiing behind the hovercraft you can see white plates strapped on the bottom of his shoes which are allowing him to water ski.
Revealing mistake: The movie is set in New York City yet during the fight in the parking garage before Jackie jumps to the adjacent building, high mountains can be seen in the distance in numerous shots.