Continuity mistake: On the beach, when Mr. Walsh is tearing up the contract we see the bits of torn paper, but when he tosses them in the air there are many more pieces of torn paper up there.
Continuity mistake: After Chunk does the 'Truffle Shuffle' and Mikey releases the bowling ball, we see the horizontal piece of wood that is painted red and attached to the porch rail, from which the silver bucket is lowered. It's seen in many shots. What's funny is that in the first shot of the Walsh's house, after the Fratellis drive past at the bottom of the hill, that piece of wood is white, because it hasn't been painted red yet by the crew. (00:05:10)
Audio problem: When Chunk flags down the car for help, he finds Jake Fratelli, who begins to sing loudly in Italian. Chunk screams, and as we hear Jake continue singing, we see his reflection in the side-view mirror as he is smoking a cigarette silently. (00:49:00)
Other mistake: When Troy is in the country club restroom and is sitting on the toilet, he has his trousers down around his ankles. When he gets shot up and crashes into the ceiling, you will notice he has red briefs on, but surely he would have pulled them down too... (00:51:20)
Continuity mistake: Outside the lighthouse restaurant as the Fratellis drive away, when Andy and Stef surprise Brand, Mikey and the others, Mikey's yellow rain slicker has a tear a few inches long, at the back of his left sleeve, that mends itself in following shots. (00:36:45 - 00:41:15)
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)
Continuity mistake: When Data starts the printing press, two closeups show the two $100 bill face templates on the machine as it prints the counterfeits, however, what is being printed on the papers are the images of $50 bills. (00:42:10)
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)
Revealing mistake: When Chunk unknowingly flags down the ORV driven by the Fratelli brothers, as Francis drags Chunk to the back hatch there are cables that run from the ORV to the side of the road, off camera. These cables were not in the previous shot when the ORV first stopped.
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)
Revealing mistake: 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.
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)
Trivia: Richard Donner, the film's director, has an uncredited cameo appearance as a police officer, on the beach at the end.
Continuity mistake: In the scene in the basement, Chunk is about to drink from the water cooler bottle that is mostly empty. When he stands up and tries to catch it, it's more than half full. (00:40:25)
Continuity mistake: At the start, when Data practices with the blue suction dart, in the close-up as the dart flies out we can see the mechanisms inside Data's invention. When it cuts to a tighter close-up, suddenly there is a spinning spool welded inside, which was not in the previous shot, that is retracting the orange string. (00:03:50)
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: Chunk breaks the glass on the frame and then he and Mikey clear away much of the broken glass from it. When there is another view of the picture all the glass is still on it.
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 Andy begins to lose it in the tunnel, Brand holds one lit lantern at the head of the line and Mouth holds another lit lantern at the back of the line (Mikey holds an unlit lantern). Next shot the lit lanterns have switched, just as they reach Chester Copperpot and Andy screams. Then in the next wideshot before it pans to the skeleton, the lantern Brand holds up switches yet again. (00:53:15)
Continuity mistake: When Mr. Perkins hands Brand the foreclosure papers and then when the two men walk away, the picket fence door is shut, but when Mikey is alone on the porch as he looks at the two men, that fence door is wide open. (00:21:10)
Answer: According to Mikey and Mr. Walsh, one of his crewmen must have taken the map and fled when One Eyed Willie was murdering his crew. This is substantiated in the novelization.