Revealing mistake: When Alferd runs from the saloon with a lynch mob behind him, we can see a line in the dirt ahead of him that serves as a marker for where he is supposed to run.
Revealing mistake: When the cab skids off the road and down the hill you can see that it never actually hits the tree - it is yanked back with about a decimeter left to go before it would hit.
Revealing mistake: When O'Bannion got paint dumped on him, he went to the curb to break his paddle. There is already visible white paint on the curb in the shape of the paddle prior to him slamming his paddle into the curb.
Revealing mistake: During the opening credits, it is obvious that the train is just a model during the initial close up shots.
Suggested correction: There is nothing in the opening shots that betray it as a model shot. Logic alone argues against it. Why would they go to the expense of building a detailed model when there is no unusual action or angles required? Especially since many of the shots are obviously not a model. Exactly how is it obviously a model?
I agree it does look like it's a model train, but that's only because of the filming techniques that make it appear to run a little choppier like it's was a light weight model. But it's real, for example in one scene that looks like it's a model, you see a real bird flying on screen.
Revealing mistake: Watch closely as Phoenix is about to fight the cops near the computer kiosk: the same two people wearing white robes pass behind the officer with the hand-held computer twice. (00:25:30)
Revealing mistake: In the scene where Rick returns from the lab with the macaroons, it is obvious that the worm man is only in half of his costume. He's wearing black pants and shoes and sitting on a stool.
Revealing mistake: The soldiers on the beach were armed with M-16 rifles. The movie period was 1962, during the Cuban Missile Crisis. The M-16 and M-16A1 were not manufactured until 1964.
Suggested correction: Just watched Matinee again after reading this. I saw M1 carbines, M1919A4 and M2.50 cal machine guns and M14 rifles. There are no M16 series weapons in this movie.
Revealing mistake: When Ryce is talking to the vet on the phone, the vet would have to be talking extremely fast because of how little time there is between Ryce's questions.
Revealing mistake: When Porthos shoots the assassin with a crossbow, he is a good distance below him. But when you see the assassin grab the bolt, it is straight in his body as if he'd been shot level.
Revealing mistake: Charlie is hanging off the ledge of the hotel when Rose chops the axe in between his fingers - if you look closely at his hand it clearly looks like rubber.
Revealing mistake: When they leave their home to go to Beverly Hills and Granny is tied to her rocking chair on the top of the car, right before she hits the tree and comes off the car, you can see she isn't a real person. It's a dummy. (00:09:06)
Revealing mistake: When they first arrive at camp and Joel goes to use his inhalers, the mouthpiece is actually in the storage position rather than the actuation position. The puff sound must have been added in later because the inhaler cannot be activated when it is put together that way. (00:22:20)
Revealing mistake: In the scene where Max is trying to find the source of the bad smell in his car, a shot from behind shows a view out the windshield. The column shifter is in Park even though Max is driving.
Revealing mistake: You can see the shadow of a camera and a microphone on Michael Biehn or Nicolas Cage back when they are fighting.
Revealing mistake: When Henry Mancini hands his conductor's baton over to the animated Pink Panther in the title sequence, he pushes it straight through the Panther's hand.
Revealing mistake: When Emilio is breaking into the cookie factory, he finds a key under a welcome mat. He then opens the door before fully unlocking it with the key.
Revealing mistake: The Turtles are preparing their time travel. Splinter tells them "The scepter will be in the temple, which means..." Pay close attention here, because now the rest of the sentence is obtained dubbing the line over a rewind of the previous footage. (00:21:50)
Revealing mistake: When Michelle Yeoh is about to hit the basket on the fire truck you can see her safety wire.