Deliberate mistake: When Jonathan and Emma are beginning to know each other, they make their way to the wood shop, where Emma picks up an "air powered tool". The tool is a staple gun, but shoots two 3" nails close to Jonathan.
Deliberate mistake: It's a humorous twist that Randy's killing is covered up by some random guys passing by with a ghetto blaster, but there was dead silence when Randy was talking earlier; not being in frame does not block soundwaves. (01:05:15)
Deliberate mistake: After Jim completes the awakening protocols, he is shown to his cabin because his door lights up. That's fine if he's the only one there, but he's not supposed to be. Presumably, there would have been hundreds of other people awakened as well, and the ship can't show all of them to their cabins by lighting their doors at the same time. But reviving every passenger separately and showing them to their rooms one at a time seems highly inefficient.
Deliberate mistake: Some clothes were interchangeable from one character to another (or within a character over time), despite their obvious differences in sizes/body frames. Hazel, as a much heavier senior citizen, was still able to wear her "lucky" carnation pink coat that fit her 58 years earlier when she was a skinny young lady. Hazel was also able to switch coats with Margot, who had a much thinner body. The coat on Margot even looked form-fitting afterwards. Kip's tuxedo did not look too large on Griffin. (00:45:20 - 00:49:50)
Deliberate mistake: When we look toward the bar, Mrs. Robinson's calf is well below the edge of the bar. In the next classic shot of Benjamin filmed from behind the bar through Mrs. Robinson's bent leg, her calf is above the bar. (00:12:30)
Deliberate mistake: During the scene where Richard is playing croquet on the lawn in front of the Delta Iota Kappa house, the letters of the fraternity are visible on the front of the house. The Greek letter for "Delta" should be a triangle yet it is the letter "D" in the shot. This is presumably to follow the "DIK" joke that would not be as obvious if written in correct Greek letters.
Deliberate mistake: When Seth Green and Lance pull up to Ian and Felicia, the car being pulled by the carriage should roll a little bit after the carriage stops moving, but instead it stops on a dime when it is only being pulled by rope, and nothing else to stop it with when the carriage stops. (00:42:00)
Deliberate mistake: In the very first shot of Korben Dallas, his bedside clock is facing away from him, towards us. We can read it, but he shouldn't be able to because he'd be looking at it backwards.
Deliberate mistake: After trying to get away from the monster, Costello finally unties the boat as Abbott rows away from the burning dock. The next shot of the boat has Abbott slowly rowing the boat, but you can see it's not moving as there's no wake, and when they jump off the boat after the Invisible man speaks, it doesn't rock, meaning the boat was mounted to something to prevent any movement, so they could make the jumps into the water.
Deliberate mistake: Jay and Silent Bob are kicked off the bus to Hollywood because they don't know they have to buy a ticket. However, in 'Chasing Amy,' Jay tells Holden that he and Silent Bob are taking a bus to Chicago. Jay even has what appears to be bus tickets in his front pocket, so he knows a ticket is needed for an interstate bus. And even if he thought it was free then, he would have found out about needing a ticket much earlier. Obviously, the earlier scene was disregarded for the sake of the joke.
Deliberate mistake: When Matt is spying through the telescope on Casey's argument with her parents, you can hear Casey yelling "No no no" and hear her bedroom door slam, etc. This is all from Matt's point of view from the telescope - it would have been impossible for him to hear any of that, being such a far distance all the way across the lake.
Deliberate mistake: During Alejandro and Elena's duel, he slashes her skirt and exposes her bare leg. When he slashes off her whole gown, she's somehow wearing leggings. Obviously so Catherine Zeta-Jones would not be naked. (01:38:13 - 01:39:20)
Deliberate mistake: Gray's rental car just happens to be the one car out of the hundreds in the parking garage that the bad guy chasing Gray and Darby crashes into, setting off the bomb he had placed.
Deliberate mistake: How does Lisa appear resplendent in that perfectly smooth wrinkle-free negligee when we saw it earlier all stuffed into her overnight bag?
Deliberate mistake: Before Superman traps the black missile, its beam is really big and covers half of the lettering on the side. When Superman is behind, the fire is much smaller and the lettering is visible, allowing us to see Superman.
Deliberate mistake: For dramatic and cinematic purposes, the floor of the court where the last scene takes place is wet, as opposed to the circle where Tony dies.
Deliberate mistake: To keep things simple, the movie relies on the Lancaster County Sheriff as a county police force. In reality, the county sheriff serves the county court (transporting prisoners, for example) but does not serve as a county wide police force. In PA, each city, borough, and township has its own police force. Note the varied colors of police cars at the farm in one of the final scenes. These were borrowed from the various local police forces (Lancaster City, for example, is robin egg blue with a white top).
Deliberate mistake: When young Odette is sliding down the banister, and gets stuck spinning around the end of it, it would be impossible to spin like that without her legs hitting the rail that she just slid down.
Deliberate mistake: During the song Adelaide's Lament, Adelaide goes to her medicine cabinet, opens it, and there is a cut to a shot from "inside" the cabinet as she surveys all the medicine she takes to treat her "cold." From the inside, the cabinet is almost twice as wide as it is when it shows her open and later close it from the outside.
Deliberate mistake: When the blue car backs up and pushes Tom and Sarah's compact over the cliff, in the close-up the woman is seen, but in the next shot it is very obviously not that woman driving away. (00:47:50)