Continuity: In the scene where Moe shows the Tenor brothers their apartment, the star on the door is gold. Later when Morty is riding around on the scooter, you can see the star on their door has changed to silver. It changes many more times throughout the movie.

Continuity: Whilst Walt and Bob are cooking at the beginning of the film, there is a large bandage on Bob's forehead. Just after chopping up the mushrooms the bandage disappears, the next time we see them it is back on.

Continuity: When May is talking to Bob in private her hair goes from being over both shoulders to being over one, to being over both, etc.

Continuity: Right before Bob has his first panic attack, Walt is holding the newspaper in his left hand. When the shots change, it ends up in his right hand without him moving it.

Revealing: When appearing at the Jay Leno show Bob and Walt give Jay Leno a hug at the same time. It is possible to see that Bob and Walt aren't connected because Jay's shirt pops in between them.

Revealing: At the beginning when cutting the tomatoes onto the buns, Bob is not even coming close to the tomato in his hand, yet slices are falling off onto the buns.

Continuity: When Bob has his first panic attack (about Walt's one-man play), he takes a glove off to hold the paper bag, but a few shots after he's wearing both gloves, without putting the glove back on.

Continuity: In the diner, when the camera shoots the twins from the other side of the table, a sugar bottle can be seen. However, when it shoots from Bob's side of the table a bottle of hot sauce can be seen (it should be seen from the other angle as well, but is absent).

Continuity: At the beginning the ketchup and mustard dollops put on the buns originally are not the same as when they start flipping burgers onto the buns a bit later.

Continuity: When Morty first appears, almost all his below teeth are gone, however throughout the movie this keeps changing, from having all from having one to none.

Continuity: In the shot where Bob and Walt are in jail and Walt is eating, you can see a cop holding a cup of coffee with both hands. In the next shot he is holding it with only one hand.

Revealing: In the intro of the series "Honey and the Beaze" which Walt participates in, you can see Walt standing by a wall that reflects him, but there is no sign of Bob that usually would stand beside him.

Continuity: When Walt is telling Bob that he wants to be an actor, the tassel on Bob's hat changes from angling back to looping forward.

Audio problem: At the start of the film we see the twins flipping burgers in their restaurant. We see that while one is throwing the burgers the other is catching them in the buns, and then dusting them with a metal jar of something. After every burger he bangs the jar on the table a few times. One one occasion, he actually bangs the jar on a burger bun, yet the sound effect is still played.

Revealing: Right after May finds out Bob and Walt are conjoined she peels out in her car. In a close up on the twins you can see on Walt's right shoulder the suit they glued to him to conjoin the two.

Revealing: In the beginning when squirting ketchup and mustard on the buns, the angles the bottles are held at and how the condiments come out of them show that he is not actually squirting anything. It's all done with computer graphics.

Factual error: When May finds out that Bob and Walter are conjoined twins, they are holding a Dunkin' Donuts bag. There are no Dunkin' Donuts in Los Angeles.

Continuity: While May and Bob are talking in private, there is a clump of leaves in the pool that appears near the life jacket, which wasn't there in an earlier scene.

Continuity: When they are getting on the bus after being turned down by some agents there is a guy with a red shirt getting on the bus. The scene cuts and shows the guy with the red shirt smoking but not on the bus. The other people in the shots are mixed up, too (the only one that stays the same is the girl Walt hits on).

Continuity: When the boys are first laying out the buns the second bun from the left in the front row has a yellow stain on it. When it comes back to them about to put ketchup and mustard on the buns the stain is missing.