Continuity mistake: Early in the movie when Lloyd gets his wallet trapped in the newspaper machine, it shows his wallet, however in the very next shot his wallet is not there.
Continuity mistake: Harry is wearing the bullet proof vest and gets shot. Yet there's no damage to it when he opens his shirt.
Continuity mistake: When Joe Mentalino eats the rat poison pills in the cafe, he dies and the character collapses on the ground with his head facing the left. But when the body is placed on the trolly a few shots later, the "dead" Mentalino has somehow managed to move his head to the right.
Continuity mistake: Before Harry and Lloyd begin their conversation about gambling, they seem to be driving by a lake; but from the inside, they're driving by a town.
Continuity mistake: At the truck stop, in the side shot in which Lloyd tells Harry to toss some salt over his right shoulder, Harry is holding his straws at an angle off the table. Then it switches to a front shot of Harry, and he is now holding his straws vertically on the table.
Continuity mistake: Right before the officer on the bike calls Lloyd a "pumpkin-pie-haircut freak", Lloyd is sitting back, straight faced, then after the officer says it Lloyd is leaning forward smiling.
Continuity mistake: When Lloyd is swinging his arms in the van, pretending to be 'running at an incredible rate', they are driving through a countryside with nothing but open plains. In the next shot, when Lloyd says 'we're really doing it though aren't we buddy?', look outside the passenger window. They are suddenly driving past houses in a residential area.
Continuity mistake: During the diner sequence, the amount of fries in Harry's basket changes between shots.
Continuity mistake: At the snow owl benefit, Helen raises her hand as Nicholas is introducing Carl. In the next shot which is the opposite angle, her hand is down, and she repeats the action, but with a drink in her hand.
Continuity mistake: During the snowball fight scene at the ski resort, it's either snowing or not depending on the angle. In one shot it's sunny. The first two shots showing just Harry feature snow. Cut to Mary and it's not snowing.
Continuity mistake: When Harry sits down on the toilet and lifts up his legs, his eyes are closed, and they remain closed until the very end of that particular shot. Then, when it switches to the front shot of Harry a few second later, his eyes are open, right from the very beginning of that shot. And if you look closely at that shot change, you don't see Harry do the action of opening his eyes - they just change instantly between the shots.
Continuity mistake: In the Unrated Version DVD, in the van sequence after Lloyd's second encounter with Seabass in the restroom, Harry says that he will stop talking about Lloyd's encounter with Seabass. Lloyd turns his head and looks over at Harry. Then it switches to a close-up on Lloyd from the other side, and we see him repeat the same action of turning his head and looking at Harry, this time more sharply.
Continuity mistake: Lloyd reads the article about Mary and can't even pronounce the word "the", yet when Harry says look on the briefcase for her name, he says "Samsonite" with no problems, and Lloyd can easily read the "Man Walks On The Moon" newspaper headline in the hotel bar.
Suggested correction: That isn't a continuity mistake - it is meant to be funny or ironic... or part of the "dumbness." Humor is often comprised of violations of expectations. He can read a big word like "Samsonite" but not a three-letter word like "the." (Less likely, it is also plausible that he didn't actually read the word "Samsonite" but recognized it as a name-brand symbol).
Continuity mistake: When Harry is speaking to the girl at the gas station, he tells her he's going to Aspen and she takes the cigarette she is smoking out of her mouth. When the camera pans to a front view of her jeep in the next shot, the cigarette is back in her mouth and she takes it out again.
Continuity mistake: When Harry and Lloyd first arrive at the truck stop, you can see a man with a white hat leaving the diner after the 18-wheeler passes by. Later on in the scene, the same man is about to exit again.
Continuity mistake: The film appears to begin in the summer. Look at the outside shots in Rhode Island when either Harry or Lloyd are driving; green grass and many leaves on the trees. As they travel further west the landscape appears to be fall. Then finally in Colorado it appears to be the dead of winter.
Continuity mistake: When Sea Bass demands to know who hit him with a salt shaker in the diner, we cut back to Harry and Lloyd's table and Lloyd begins pointing at Harry. When the camera angle changes, Harry turns around and Lloyd begins pointing a second time.
