Revealing mistake: After getting a mouthful of soap from Eddie, Smart Guy is thrown across the room and loses his gun. When the gun hits the wall you can see it dangling from a puppeteer's string in mid-air. (00:42:15)
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)
Revealing mistake: When Toon Town's red curtain rises for Eddie in the long tunnel, the reflection on the pavement doesn't move correspondingly. (01:10:00)
Continuity mistake: After fooling Lena Hyena with a road divider, Eddie's necktie blows over his left shoulder. But once the angle changes, his tie is suddenly hanging down again like normal. (01:13:30)
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)
Revealing mistake: When a bar of soap knocks Wheezy into the window blinds, he casts no shadow on the wall, but his Tommy gun does. (00:42:30)
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: 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)
Revealing mistake: When Eddie is carrying Roger into Dolores' secret room, keep an eye on the swinging light. At some points, Roger's image is translucent and the light can be seen right through his ears. (00:44:10)
Revealing mistake: Tire tracks from a previous take can be seen on the pavement as Benny the Cab skids to avoid a collision with the Red Car. (00:58:30)
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: In the scene where Eddie pauses at Toon Town's entrance to load his gun, the Plymouth changes its position on the road relative to the double-yellow lines. (01:08:00 - 01:09:25)
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 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: 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: 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)
Continuity mistake: When Eddie unfastens his suspenders, the glass he placed on the newspaper changes its position between shots. (00:36:05)
Revealing mistake: As soon as Eddie walks into the Ink & Paint Club to see Donald and Daffy on stage, a shadow of one penguin's drink tray is cast on the wall near stage left. However, the penguin's shadow isn't animated into this shot. Instead what we can see is a shadow of the pole, which was used by puppeteers to carry the tray around the club before any animation took place. (00:15:00)
Audio problem: As Eddie walks into the bar with Roger stuffed into his coat, you can hear somebody shooting pool. But only two seconds later Eddie walks past the pool table and, here, we can see one of the patrons actually passed out and laying down on top of it. It would be impossible to shoot pool under those circumstances, which means the pool ball noises were dubbed over. (00:43:20)
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.