The character's electrical cords constantly appear, disappear and change length throughout the entire film.
After the rats bite the picture of the "master" it appears without the bite mark, when the appliances are overlooking the city. Then in the junk yard the bite mark reappears.
When the appliances are about to leave, there is a shot of the front door with its knob on the left. When Kirby finally opens it, the knob switches sides.
During the "Worthless" song scene in the scrapyard, the Surfer car's left (driver's side) headlight falls out soon after being picked up by the magnet. When laying upside-down on the conveyor, the missing headlight has switched to the passenger side.
The configuration of the conveyor belt in the junkyard changes from shot to shot.
A car battery cannot withstand a lightning strike.
After Lampy is struck by lightning in order to get power for the appliances' battery, his bulb is broken and the area around the bulb is burnt along with his plug, which disappears after when he obtains a new bulb. The burn marks were actually washed off when the appliances fall into the rapids earlier. How his plug is fixed is unexplained, though.
When Toaster is putting the last available fuse in the cottage's breaker box, an animation glitch occurs when the fuse clips through the wire he's hanging on.
At the very end of the film as we see an overhead shot of Chris's car driving down the road, an animation glitch occurs where the car merges back and forth erratically on the left and right lanes.
"Available" is misspelled in "Cutting Edge"; in a parody of commercial techniques, a balloon appears that says "NOW AVALIABLE!"
Many times, the various characters demonstrate the need to be plugged in (and actively drawing energy from the power source), while at other times, they seem totally independent (Lampy, for example, can use his light freely, yet it draws down their battery when he is plugged in).
Early on in the movie, Kirby mentions that they have been doing chores and cleaning the Master's house for the last 2000 days, which is nearly five and a half years. However, during the musical cleaning sequence, complex cobwebs are in easily reached areas, the windows are caked with dust to the point of being opaque, and all surfaces seem generally dusty. If no humans have been living there for 5.5 years and the appliances have been "doing chores" as they are shown doing every day, there's no way the house could be as filthy as it is shown to be.