Factual error: The picture of Eddie and Teddy on the road with dad, supposedly taken in 1906, shows a Ringling Bros and Barnum & Bailey circus poster. In 1906, the Ringling Brothers circus and the Barnum & Bailey circus were two separate circuses playing in different parts of the country. They did not combine the two shows until 1919. (00:27:00)
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)
Revealing mistake: When the weasels are at Eddie's apartment and Roger is handcuffed to Eddie, Roger runs under the bed and drags Eddie on the floor. As he pulls him you can clearly see a board with wheels under Eddie that is pulling him under the bed. (00:38:50)
Continuity mistake: In the bar fight scene when Stupid knocks down Doom and some other guys, you can see Delores wielding a bat at the other end of the bar. In the next shot when Eddie kicks Psycho, Delores is suddenly behind the bar where Eddie is. (00:56:45)
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)
Revealing mistake: Watch when Baby Herman confronts Eddie Valiant in the hallway at Valiant's office. The screen image may be of Herman, but the studio lights clearly cast the shadow of the puppet-machinery used to animate Herman's actual prop cigar in the baby carriage. (00:34:45)
Visible crew/equipment: When Roger and Eddie get in a truck and there's no key, Roger hears the voice of Benny the Cab in the back of the truck. He then slides through a little window and his love letter to Jessica pops out of his pocket. A black glove can be seen pushing this letter through the window. (00:55:15)
Revealing mistake: Close to the film's climax, when Doom is showing off his Dip Machine, we see one of the weasels hoisting a canister of Dip up a ladder. If you look close, you can see a large wire pulling the canister up. This was seen in the VHS version and may have been corrected in the DVD, I am unsure. (01:19:20)
Visible crew/equipment: When the weasels search for Roger in Eddie's office, there is a shot where Smart Guy kicks a box aside right after he tells the others to stop laughing. To the right is the shadow of a puppeteer pulling the box up in the air. (00:42:45)
Continuity mistake: When Eddie Valiant is in his office, and he examines the newspaper photo of Jessica Rabbit and Marvin Acme, the picture doesn't match the photos shown to RK Maroon earlier in the film, and neither does the original of the photo he looks at next. The photo shows an earlier, less sultry version of Jessica, in a halter-neck dress. (Jessica wears a strapless dress throughout the film). The DVD's Toontown Confidential special feature mentions that Jessica's look changed during filming, and the scene where Eddie takes down the Jessica photos and looks at the holiday photos of him and his brother was re-shot to show the new Jessica. Looks like they either missed the newspaper scene or felt that the view was so brief it wasn't necessary to change it. (00:35:49)
Revealing mistake: When Roger is bouncing on Eddie's bed, the landings are not in time with Roger's feet. (00:38:45)
Revealing mistake: When Judge Doom has transformed into his toon-self for the first time, he bounces after Eddie with yellow springs on his feet. Between when he takes off and when he lands, they show 4 different shots. In shots 2 and 3, you can see about 6 black suspension wires running into his clothes and carrying him through the air. (01:26:30)
Audio problem: In the secret room where Hoskins and Dolores are hiding Roger right before Hoskins hits his head on the lamp he says, "crazy tunes," but his mouth doesn't move. (00:44:25)
Revealing mistake: When Valiant came upon the ugly Jessica look-alike, and she began to chase him, the chase ends with Eddie moving the roadline towards a wall, the results of which are her crashing into it. When Eddie throws the line to the wall, you can see that the cartoon line goes a bit "into the filmed wall" and covers a part of it. (01:13:30)
Visible crew/equipment: In the alley scene, where the two motorcycle policemen collide with the police car, and the motorcycle cops fly over the car, you can see the landing pads placed on the pavement to cushion their fall. (00:57:05)
Continuity mistake: In the scene where Roger and Hoskins are moments away from crashing into a bridge in the cab quickly look at the road there is no gate in between the roads. But when they jump onto the bridge they crash right into a gate. (00:57:15)
Revealing mistake: Before Benny crashes into the pole while carrying Eddie and Jessica, they show a shot in front of it of him coming towards it, and you can see the pre-cut line in the pole where it breaks in half. This is better seen on the VHS version, it is harder to see on the DVD, but it's there. (01:16:10)
Revealing mistake: When the weasels are in Valiant's apartment and the leader says, "Step outta line and we'll hang you and your laundry out to dry," you can see the shadow of the mechanical arm used to hold the gun cast on Hoskins. (00:42:50)
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)
Visible crew/equipment: In the scene where the weasels are chasing Roger and Hoskins and the weasel says, " I'm going to blow his head off ", look at their icon on the side of their door then quickly look to the left you can see the bumper and back end of the car that is driving the camera. (00:56:05)
Answer: There's really a lot of possible reasons he hates other toons. There's a whole Roger Rabbit book and comic book series that explain Doom's background more. In the film, he's greedy and wants to destroy Toon Town to build the freeway to make more money. In human disguise he's also seen as merciless and is just punishing toons to maintain law and order, etc. Although that's just an excuse to kill toons as well. However, not explained in the film; as a toon he was cast as the antagonist in cartoon films until an accident one day left him thinking he was an actual villain (as opposed to just an actor playing one). That's when he began his life of crime, including killing Teddy Valiant. So his hatred of toons is more about him being evil and not a personal vendetta against them, like Blade's motives.