Continuity mistake: At the beginning of the movie, Harry's van has bucket seats, yet later on when the "gas-man" rides along, he is sitting on a bench seat in-between Harry and Lloyd. (00:38:00)
Suggested correction: Mental isn't sitting on a bench seat, it's implied he's sitting on the floor of the van in between the both of them. Although hard to see, the backs of the bucket seats can still be seen behind Harry and Lloyd at certain points. You see a fair bit of it behind Harry whilst he's dancing as Lloyd sings the line "and if that mocking bird don't sing".
Continuity mistake: When Lloyd tackles Mary on the hotel stairs, she is wearing black pantyhose. By the time they get to the hotel room, she has miraculously changed into grey tights. (01:28:45)
Visible crew/equipment: When Lloyd is daydreaming about Mary as the doors to Mary's house open and Lloyd picks up Mary. He lifts up her skirt to show a little flesh, in the background you can see the feet of two crew members laying on the ground holding the doors open. (00:31:10)
Continuity mistake: When Lloyd drops Mary off at the airport and hugs her goodbye, in the background there are two men walking towards them. The camera changes to the angle behind Mary then behind Lloyd and then back to the side. When it returns to the side view the two men are farther away but still walking toward them. (00:07:25)
Continuity mistake: When Harry and Mary go out on the date to the ski resort, when they get into a snowball fight, the camera shows Harry, and it's snowing, but when they show Mary (who is supposed to be right beside him) it is not snowing. It keeps doing that, when it shows Harry it's snowing, and Mary it is not (or vice versa). (01:17:50)
Continuity mistake: When Lloyd asks if the bartender knows Mary, he originally grabs the bartender with the left hand. But in the next shot he lets go of him with his right hand. (01:19:18)
Audio problem: When Harry and Lloyd pick up the hitchhiking natives, when they were playing the mockingbird song, the guitar was playing but his hands weren't moving at all. (00:40:38)
Revealing mistake: The Aspen lift operators are wearing Copper Mountain uniforms. Copper Mountain is in Colorado, but it is over two hours away from Aspen.
Visible crew/equipment: When Harry and Lloyd are leaving Providence, there is a hand moving the curtain behind Harry.
Continuity mistake: After leaving the diner, Lloyd & Harry are pulled over by a motorcyle cop (Harland Williams). As the cop notices the beer bottles on the floor of the van, you'll notice his hair has a curl hanging over his forehead. Right before he takes a drink of one of the bottles, the curl is gone. It cuts to Lloyd & Harry trying for a brief second , and when it cuts back to the cop saying "You'd shut your mouth if you knew what was good for ya," the curl is back. (00:28:06)
Visible crew/equipment: On the DVD when Harry is in the bathroom (from the ex-lax) as he sits on the toilet if you look on the floor you can clearly see the dolly track for the camera. (01:20:45)
Revealing mistake: When the air bag inflates at the airport and Lloyd is wrestling with it for a split second he pulls it back and you can see it is not attached to the steering wheel. (00:08:40)
Continuity mistake: When Lloyd states that the map says they've only driven a quarter of an inch, you will see a creek with a unusual tree growing around it. You see the same creek and tree when Harry and Lloyd pick up the "gas man". (00:37:00)
Continuity mistake: When Jim Carrey and Jeff Daniels are in the restaurant, just before they encounter Seabass and right after they call the waitress "Flo", Jeff's coke glass is on his right side. The next shot shows it on his left, then his right, then his left again, without him touching it. (00:21:56)
Revealing mistake: When Harry is lying on the bed at the end - you can see he's not wearing a bullet proof vest as the extra bulk they cause is not visible on his torso. However once he's shot, the bulk is visible under his shirt for the remainder of the scene.
Visible crew/equipment: I think you can only see this in the DVD version, but when the guys are at the important benefit with the owls and Lloyd pops the cork off the wine bottle which kills one of the owls, in the part where you see behind the cork and it is spinning you can see the stick which holds it (the cork) up. (01:12:02)
Continuity mistake: After Mary removes Harry's tongue from the pole her ski out fit is blue when before that it was black.
Continuity mistake: When Harry and Lloyd are leaving Providence, in the first shot of the highway we see them driving on Route 146. In the next shot showing the Highway, they are driving on Route 95 South. There is no way they can be driving on both highways at the same time, and, if they could, they would be driving in opposite directions at the same time.
Revealing mistake: When Lloyd and Mary are going to the airport, you can see a white van out the rear window. The driver is turning the steering wheel, but he keeps going straight. (00:04:30)
Continuity mistake: When Lloyd is trying on tuxedos, the shot from the back of Harry's head you see a short cigar in his mouth. In the next shot from behind (when he stands up), the cigar gets bigger. (01:04:40)
