Factual error: Look carefully at the electric trolleys trundling around the streets (and that Valiant hitches a ride on). You'll see that although they have boom arms on top, which are usually hoisted up and connected to overhead powerlines, there are no overhead wires anywhere for them to be getting electricity from. [Notice in the scene when Valiant gives Dolores the check, a Red Car Trolly passes outside the window and sparks fly from the overhead wire contacts. In all of the scenes outside the bar the wires are gone]. (00:10:10)

Continuity mistake: At Maroon's office in the beginning Eddie is holding a newspaper. The way he holds it changes between the shots. (00:06:10)
Factual error: The Goofy cartoon Roger watches in the theater was made in 1949, but the film takes place in 1947. (00:59:50)
Continuity mistake: When Eddie Valiant gets thrown in the garbage by the gorilla he stands up and there is some trash on his back and hat, but when the camera changes shot the trash is gone. (00:21:25)
Visible crew/equipment: When Eddie tries throwing Roger out the door, Roger explains that he's being framed by somebody. Here, notice the film crew's power supply cords running along the floor from the hallway into Eddie's apartment. (00:37:45)
Continuity mistake: When Eddie is looking through Jessica's keyhole his left arm is down. When it cuts he is leaning his left arm to the wall. (00:20:15)
Continuity mistake: When Maroon says "Get me a couple of juicy pictures I can wise the rabbit off with" to Eddie, you can see him standing almost face to face with him. But when it cuts from behind Maroon he is standing away. (00:06:30)

Deliberate mistake: The window blind in Maroon's office changes to a sheet of tambour (as found in roll-top desks) just before Roger crashes through it. This was to ensure his outline remains perfectly in it, otherwise pieces would drop out which are not attached to the strings on either side. (00:23:25)
Continuity mistake: In the scene where Hoskins says, "I'm calling the cops," his eyes are following Roger as he walks across the desk, but when you see Roger he is still standing near the chair. (00:39:30)
Continuity mistake: Throughout the film the buttons on Smart Guy's jacket switch from pink to gold.
Revealing mistake: When Wheezy and Psycho laugh at Smart Guy after he has fallen down the stairs, if you look closely you can see the wires holding Wheezy's machine gun up. (00:42:20)

Continuity mistake: When Mr. Acme meets Eddie at the joint, he squirts the magic ink at him. The position of the things on his table keeps changing between shots. (00:15:45)

Continuity mistake: When Maroon asks if Eddie's got the will, you can see Eddie holding his coat with both hands. When it cuts he has his arm inside his suite. (01:02:55)

Continuity mistake: In the office of Maroon, Valiant gives back the paper to Maroon. The next shot he is holding it, but in the next shot its in his left pocket. (00:06:45)

Continuity mistake: When Valiant walks out of the garbage and reaches to a window in front of him, the box and bottles next to it change positions between shots. (00:21:45)

Continuity mistake: When Roger jumps out of the chair and through the window in Maroon's office, you can see the glass shatter with jagged edges at the bottom and no clean outline of Roger. The next shot shows the glass cleanly cut in Roger's shape. (00:25:00)

Continuity mistake: When Angelo is messing with Eddie you see Angelo holding an egg. When Eddie grabs him you can see the egg is suddenly peeled. (00:12:55 - 00:13:05)
Continuity mistake: In the scene where Judge Doom is going to put Roger in the dip Hoskins offers Roger a drink. He takes the drink, but in the next shot takes the drink again but not the same way; the drink spills all over the counter. (00:56:20)
Revealing mistake: Hoskins and Maroon break the news to Roger Rabbit, and Maroon gives Roger a drink. When he pours the drink you can see a clear plug in the neck of the bottle, and right before Roger Rabbit drinks you can see there is nothing in the glass. (00:23:40)
Continuity mistake: As Eddy Valiant walks out of Maroon Cartoon studios in the beginning a hippo bumps into him, then walks away. About 7 seconds later you see the hippo sit on a bench causing the bench to collapse to one side and a man fly up. You can clearly see the rope that pulls the man up as well as the actual person holding the rope. (00:09:10)
Chosen answer: According to the director, Pattycake is the toon equivalent to sex.
Greg Dwyer