Continuity mistake: In the scene where Valiant is sitting in the Night Club and meets Betty they start to talk. Notice she puts down her tray off to the side, in the next shot the tray is nowhere to be seen. (00:17:40)
Continuity mistake: When Jessica appears on stage, Eddie has Betty Boop standing next to him in all close-up shots, except for a wide shot of the public behind Jessica where Boop is missing. (00:18:15 - 00:19:05)
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: After Jessica's Ink & Paint Club performance, the audience gives her a round of applause. As soon as Marvin Acme stops clapping his hands, the shot changes - but now he's seen clapping again all of a sudden. (00:20:25)
Other mistake: When Eddie Valiant gets thrown out of the Ink and Paint Club, he is already starting to go through the air as the gorilla moves his hands to throw him. (00:21:20)
Continuity mistake: In the scene where the gorilla is throwing Hoskins out of the club notice he is facing forward but when he lands in the trash he lands on his back. (00:21:20)
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)
Revealing mistake: After Bongo the Gorilla Bouncer tosses Eddie into a pile of garbage cans in the back alley, Eddie lifts himself up and here we can see that he's wearing knee pads beneath his pants. (00:21:25)
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: After Acme and Jessica's patty cake incident, we see Eddie taking a stack of pictures from R.K. Maroon as Roger repeatedly bashes his head on the desktop. Between shots, Eddie's left arm immediately moves to his side. (00:22:45)
Continuity mistake: When Roger is blowing his nose, Eddie stands in the background holding a stack of pictures with his left hand (offscreen), but in alternating shots the pictures shift hands (widescreen only). (00:22:55)
Continuity mistake: When Eddie hands Roger the patty cake photos in R.K. Maroon's office, they look cluttered. Cut to the next shot and the photos are suddenly stacked neatly. (00:23:05)
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)
Revealing mistake: As Roger gets ready to take a drink of bourbon in R.K. Maroon's office you can see a moving shadow on the desktop - which is that of a mechanical arm used to hold the shot glass. (00:23:40)
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)
Revealing mistake: When Roger takes a shot of bourbon and blows his top, it causes most of the glass objects in R.K. Maroon's office to bust into pieces. In some instances you can see an explosive charge breaking the glass - like the giant angel statue at the center of R.K.'s trophy collection. (00:24:00)
Continuity mistake: After blowing his top in R.K. Maroon's office, Roger rests his head on the desktop. Watch how a black ledger appears beneath Roger's head by the time R.K. and Eddie walk over to comfort him a few moments later. (00:24:10)
Continuity mistake: Eddie's arms change position between shots after Roger drinks the bourbon and collapses face-first onto R.K. Maroon's desk. (00:24:15)
Continuity mistake: After Roger has a violent reaction to R.K's drink, a decanter bursts open and leaves bourbon all over the blinds. But moments later when Roger crashes through the window and leaves an outline of himself, the blinds are completely dry. (00:24:20)
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)
Answer: Valiant also shares his name with Arthurian comic strip hero Prince Valiant, who wields a singing sword, Flamberge.