Continuity mistake: On the deck of the Inferno, when Mama is pulling the pearls from Mouth's mouth, Francis is tying up Andy's hands with black rope. When Mama asks, "Is that all?" the color of the rope is off-white, but it then changes back to the black rope in the following shots. (01:32:30)
Continuity mistake: When Francis Fratelli pours the gasoline in front of the County Jail, there's a parked police cruiser at the corner of the building next door, in front of its windows. After he ignites the fire, there is a close-up of the ORV's tire as the vehicle pulls away, and in the background that squad car is gone, but in the next overhead shot that parked police cruiser is back. (00:02:10)
Revealing mistake: Up in the attic, when Chunk walks over to Mikey (who wants Chunk to drop the frame), at that moment Data and Brand are alone, and while the two of them are looking at the plasma lamp Brand flicks the glass with his finger, and just as Data stares at Brand we can clearly hear Data say, "Don't touch it Josh!", which is Brand's real name. (Mikey does the same thing later at the lighthouse restaurant.)
Continuity mistake: In the beginning, when the Fratellis are eluding the Police, Chunk witnesses the chase. In the first shot the slice of pizza is on the window. Next shot Chunk holds it in the air, and in the third shot the pizza is back in its place where it was in the first shot, with a saucy smear on the window. (00:04:10)
Continuity mistake: On the Inferno's deck, after Mouth spits out the jewels from his mouth, when Andy calls Mama, "You gross old witch," Francis is tying up Andy's hands and his sword is held between his legs, but in the next shot Francis is behind Stef and the sword instantly appears in his hand held high. (01:32:45)
Visible crew/equipment: When Troy is in the country club restroom, the toilet overflows and he gets pushed up to the ceiling, you can see that he is sitting on a platform. When the water shoots out, you can see the pole connected to the platform being raised up.
Other mistake: When the Fratellis get out of the water, they show no signs of being wet at all, like when they catch the Goonies near One Eyed Willy.
Revealing mistake: When the Fratellis get a visit from the bats out of the basement, two bats fly in front of Jake Fratelli and while they are flying in front of him you can clearly see their wires.
Continuity mistake: When the kids light the two lanterns they find in the pipe room, they stay lit somehow, even though the lanterns get wet in the well.
Revealing mistake: At the Astoria Country Club, when Troy first sits down in the stall and opens the magazine, behind him are at least nine columns of small patterned tiles. In his next close-up as he looks around, the wall behind him is completely different. Now there are only six columns of larger unpatterned tiles, with a long vertical gap between the tiles (where the grout should be) - which is the track for the mechanism to lift Troy in the following shots. (00:51:00)
Continuity mistake: When Data's 'bully blinders' are on, just as the bulbs dim, in the close-up Data's cartridge holder hangs over his right shoulder to his left hip instead of the opposite way, as seen in the previous and following shots. Interestingly, this is not due to a flipped shot. (00:48:20)
Other mistake: Up in the Walsh's attic, in three shots of Mikey as he continues to say, "Then he loaded it all up onto his ship and he sailed away into the sunset..." there is something black hanging down from the top of the screen that stays put as the camera pans in closer to Mikey's face. It disappears, then reappears when he says, "Trapped." (00:17:20)
Continuity mistake: Before the 'bathroom' break, when Mikey holds up the map, the top of it is burned off and very few musical notes are actually there along its edge, but when they reach the skeleton's bone keys the top of the map is clean, with a musical score along the entire edge. (01:29:30)
Continuity mistake: After letting the air out of Brand's bike tires, Mouth shuts the picket fence door (the door near the boat) and then Mikey begins to ride away on his bike, but next shot as he rides past, that fence door is wide open. (There are two fence doors - one near the boat and the other one Chunk used earlier.) (00:23:25)