Revealing mistake: After the jailbreak, a number of reaction shots for which the shot background is the villagers in the speeding wagon, not only do they not "bounce" with the wagon, they are not even animated.
Revealing mistake: Just after Mr. Creosote explodes and all of the guests are vomiting, there is one male guest third from the front that is puking. Though his hand is up near his mouth, it is clear that the puke actually comes from his hand rather than his mouth, revealing that he is holding something that produces the fake vomit.
Revealing mistake: While Barnum and Phillip are singing "The Other Side" Phillip knocks over the first stool then steps on its side, and in this closeup we can see the extra two flat bars attached between the legs, for him to easily step on. We also see that the stool's seat is perfectly round in the closeup, but in previous and following shots, such as when Carlyle jumps off the bar then grabs his hat, one side of the seat has been cut to allow it to rest flat on the floor while on its side. Presumably, the closeup was digitally edited to make the seat appear round. (00:38:05)
Revealing mistake: The film contains a few animation glitches which usually only last a frame or two. These could have been fixed during the film's digital restoration, but were left in, presumably because the restorers didn't want to alter a single detail of the original animation. A prime example occurs when Snow White is leading the animals to the Dwarfs' cottage. As she approaches the door, a fawn steps in front of her, and its head completely disappears for one frame.
Revealing mistake: When Tommy and her boys are roughing up Randolph in Angie's apartment, Tommy throws Randolph across the room into the piano. The vase sitting on top of the piano falls before Randolph ever touches the piano. Seen better in slow-mo. (00:57:20)
Revealing mistake: When Max is singing the song "Betrayed", the bars of his cell shake visibly several times.
Revealing mistake: During the subway scene, when the first pillar breaks and starts to move towards Dorothy, the top of it is cardboard and wiggles back and forth as the pillar breaks. This is noticeable in the other pillars as well.
Revealing mistake: When Tommy's parents die he puts their hands together. As the camera shows the close-up of their hands his mother's pinky finger twitches.
Revealing mistake: During the opening musical number, right before Gary joins the large group of people for the dance, he accidentally kicks Walter out of frame. Watch closely though. His foot comes nowhere near Walter when he supposedly "kicks" him.
Revealing mistake: In the beginning when Mrs. Meers goes into the elevator, you can see that the elevator floor is a continuation of the room floor, just with a strip across it.
Revealing mistake: The first morning, when Robert takes Giselle to work, they enter atrium of the Time Warner Center (the well-known statue of the female Giselle admires is one of a set, the other is male), which is located at 8th Ave and Broadway, at the southwest corner of Central Park. Upstairs, when Sam tells Robert that she can't find where Giselle is from, and then when Giselle speaks to Phoebe, the very distinctive Johnson Lipstick Building (it's reddish and has three receding oval-shaped levels) at 53rd and 3rd is seen outside the window. The office scene is obviously not filmed at Time Warner, because it's impossible to be in an office at 8th and Broadway, on the West Side, and be next door to a building located at 53rd and 3rd, on the East Side. (00:35:40 - 00:40:35)
Revealing mistake: In the scene where Rooster is driving/running away from the gangsters, he is supposed to be alone in his car but in one shot a hand appears and is holding on to the passenger side door from inside the car.
Revealing mistake: During the scene when Hawkins is in the jousting tournament, Griswald takes a swing with his mace and apparently smashes Hawkins' head (inside his helmet) off. Then the horse Hawkins was riding stops, and he extends his head from inside his suit of armor and smiles. Watch carefully throughout this shot - Hawkins' hair/the back of his head can be seen past the edge of the armor where the hole for his neck should be.
Revealing mistake: During the singing at the inn, when Sacha Baron Cohen raises the bottle, stage lighting screens are reflected on the glass.
Revealing mistake: During the song "Mark it Up", when Pavi supposedly snatches the panties/thongs off of the two girls, you can see they are already in his hands before he does so.
Revealing mistake: Part of the concept of the film is that, save for Jesus and his disciples, Manhattan is deserted for one day. However, during the baptism scene in Central Park, you can see a horrified man in the lake on a boat, desperately trying to row out of the scene.
Revealing mistake: The shot in the station is somewhat revealing, not only a modern diesel train (as already reported) in 1914 but also a third electric rail. (01:05:15)
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: After Alice falls down the hole, into the leaves, she gets up and runs down a stone to follow the White Rabbit. As she runs down the stone, it quite visibly squashes down under he feet, revealing that it is foam.
Revealing mistake: Near the end of the film, the mayor, played by Jim Backus, is speaking to Elliot the dragon, who is invisible. The mayor has a cigar in his mouth and smashes it when he turns to greet Elliot. The scene is accomplished by having Backus turn and smash the cigar into a large pane of glass. However, the reflections on the glass are visible.