Continuity mistake: When Eddie starts browsing through his Catalina pictures, a white cup on the desktop changes its location between shots. (00:26:15)
Continuity mistake: As Eddie sits at his desk and starts looking at the second Catalina vacation photo, his hands grip the stack of photos in different locations between shots. (00:26:20)
Factual error: Eddie Valiant sits in his office looking at the "vacation" pictures also on the roll of film in the camera borrowed from Delores. One of the negatives is crooked in the enlarger and shows 35mm sprocket holes. This was not a 35mm camera. (00:26:55)
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 Mr. Acme is killed with a piano, there's a cop next to a briefcase taking pictures of the crime scene. A frame later the cop is 1 meter away from the briefcase. (00:29:05)
Continuity mistake: In Acme's factory where a crime scene investigator finds the toon boxing glove mallet, his left hand releases itself from the handle between shots and several paintbrushes on the desk keep changing direction throughout the scene. (00:29:40)
Continuity mistake: When the officers are carrying Marvin Acme's gurney away, one of them bumps into a crate of squeaking shoes. As the crate topples over, its lid flips upside down between cuts. (00:30:25)
Continuity mistake: When the weasels make their appearance at Mr. Acme's crime scene their car knocks some boxes off. From one angle they are all scattered next to the front bumper, but when the angle changes they're gone and have moved several feet to the right. (00:31:55)
Continuity mistake: When Judge Doom is about to dunk the squeaky shoe into the Dip, it seems to stick itself in for him, even though it looks rather scared. (00:33:35)
Visible crew/equipment: Set lights are visible on the ceiling for a few shots in the scene where Eddie and Baby Herman are discussing Marvin Acme's will. (00:34:30)
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 Eddie grabs a newspaper from Baby Herman, you can briefly see the mechanical arm used to hold it - sticking out of the carriage for a split second. (00:35:00)
Continuity mistake: When Eddie and Baby Herman are in the hallway discussing the late Marvin Acme's will, Eddie repositions the baby carriage and starts unlocking his apartment door. He then turns around to face Baby Herman, but between shots his body rotates back to its original position. (00:35:20)
Continuity mistake: When Baby Herman's cigar falls to the floor its position changes between the first and the second angle in half a second. (00:35:35)
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)
Continuity mistake: At Valiant' office notice the bottle of whiskey on the table, right before he examines the pictures of Jessica and Acme, the bottle is about almost full. But in the next scene after he finds out that Roger is there he sits down and you hear him pour himself a drink. In the next shot the bottle is almost empty and he is holding a glass that only holds about a mouthful of whiskey. How could he pour that little amount of whiskey and lose that much? (00:36:00)
Continuity mistake: When Eddie unfastens his suspenders, the glass he placed on the newspaper changes its position between shots. (00:36:05)
Visible crew/equipment: Right before Eddie goes in for a closer look at the will in Marvin Acme's patty cake photo, a boom mic is reflected in the magnifying glass. (00:36:15)
Continuity mistake: When Eddie breaks out the magnifying glass to get a better look at Marvin Acme's will, his left thumb jumps to a different position on the photo between frames. (00:36:20)
Continuity mistake: When Roger is in Eddie's apartment hiding from the Toon Patrol, a picture on the nightstand by the pull down bed changes positions on its own. (00:37:20)
Answer: Valiant also shares his name with Arthurian comic strip hero Prince Valiant, who wields a singing sword, Flamberge.