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: When Eddie is at the kitchen sink pretending to do laundry, Smart Guy pulls up a chair and starts asking about Roger's whereabouts. Eddie is squeezing a black sock with his right hand, but between shots he submerges it in the water. (00:41:40)
Continuity mistake: In the scene where Hoskins is washing his clothes and hiding Roger notice that the weasel talking is holding a gun. Hoskins puts a bar of soap in his mouth and the gun disappears. Then when he comes back to Hoskins the gun reappears. (00:42:15)
Continuity mistake: In the scene where the weasels are in Eddie's office, when the other four weasels see their leader falling down the stairs, Stupid (the fat weasel) closes the middle drawer on the filing cabinet. In the next shot the drawer is open. (00:42:20)
Continuity mistake: When Dolores is informing Eddie that Cloverleaf wants to get their hands on Toon Town, her head changes position between shots. At first she's looking in Eddie's direction, but then suddenly she's got her eyes on the new Cloverleaf billboard. (00:49:05)
Continuity mistake: When Doom writes on the bar's blackboard "Rabbit Dip" the look of the text keeps changing all the time: sometimes it's neat, others it's fuzzy, and others some letters are missing. (00:52:10 - 00:53:10)
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)
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)
Continuity mistake: After Eddie overturns the drum of dip and flees with Roger, a patron on Doom's left side falls on his back twice in successive shots. (00:57:00)
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)
Continuity mistake: The driver's side windshield wiper on the Toon Patrol car moves itself to a different position as Eddie and Roger try and make a getaway near the bar. When Eddie looks for a key, only some of the wiper actually makes contact with the windshield, but one shot later the wiper has moved significantly further towards the center. (00:57:25)
Continuity mistake: After Eddie and Roger spring Benny the Cab from the Toon Patrol's car, the amount of sunlight being cast changes instantly between shots. (00:57:50)
Continuity mistake: During the alleyway chase, a trashcan on the side keeps appearing and disappearing through shots. (00:58:50)
Continuity mistake: When Valiant and Roger are in the cab trapped in the alley, the distance to the exit of the alley keeps increasing and decreasing wildly as well as the distance to the police car in front. (00:59:00)
Continuity mistake: The toon patrol car hits the 2 police motorcycles in the middle of the long alleyway, yet after they crash the cops then land in the middle of the street. (00:59:25)
Continuity mistake: When Benny the Cab approaches a bridge where the woman is pushing her baby carriage, the sun casts shadows at wildly different angles in alternating shots. (00:59:30)
Continuity mistake: After the alleyway scene, the cab jumps on a bridge. The first angle shows that there are no cars next to the woman with the pram, but half a second later, when the angle changes, there's a grey blue car behind. (00:59:35)
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: After Roger interrupts their kiss in the theater, Dolores looks into Eddie's eyes and says he'd better get going. In the next shot, they're suddenly looking away from each other. (01:03:25)
Continuity mistake: When R.K. Maroon is in his office expecting a visit from Eddie, he takes a pistol and slides it about halfway into his pocket. But between shots, the pistol slides all the way in. (01:05:00)
Answer: Valiant also shares his name with Arthurian comic strip hero Prince Valiant, who wields a singing sword, Flamberge.