When Doug and Bob go off the end of the wharf in the van, all interior shots show the rear doors closed and all the exterior shots show the rear doors open.
When Bob is giving the man and his children their money back in the alley, a woman is passing them just as the camera changes angles. When it does, the woman is gone.
When Doug McKenzie types in the code to get the floppy from the safe, he hits a vertical row of numbers on the keypad. However, when Ted and Brewmeister Smith views the video, it shows a different video of Doug McKenzie's hand hitting a different sequence of numbers.
The first time Doug plays the game, the display shows Pam Elsinore "Level 6" 211,059 and she exclaims her birthday is 21-Oct-59. The screen clears and redraws showing John Elsinore "Level 7" 040483 (no commas) and Pam Elsinore "Level 6" 070483. When Pam looks at it the second time (later scene), she says 04-Apr-1983 is the date her father (John) died. The 070483 does not appear the second time and there is no explanation for what - if anything - happened to her on 07-Apr-1983.
When the van goes underwater, and LaRose jumps in to free Pam, you can see her swimming up to the top without shoes. When the rescuers pull her from the water, she has her shoes on.
The definition that Claude Elsinore gives for catatonic schizophrenia (referring to Pam) is word-for-word the exact same as the definition that Brewmeister Smith later gives for paranoid schizophrenia (referring to Bob and Doug). Although one may think that this is because of Claude Elsinore's lack of education in psychology, the definition is actually a better fit for catatonic schizophrenia than for paranoid schizophrenia, so Brewmeister Smith, the psychiatrist, is farther off than Elsinore.
When Bob and Doug go to the brewery and find Pam stuck in her Volkswagen convertible in the gates of the brewery, she says something to the effect of "Help I'm stuck and I can't get out". She is in a Volkswagen convertible and the top opens mechanically from the inside, which would be easily to unlatch and put down. However, since the car is being held by high-voltage electric gates, it's reasonable for her to avoid touching anything connected to the exterior.
At the end of the court room scene, the picture behind the judge, which was obviously supposed to fall off the wall as he bangs his gavel, falls a couple of seconds too early.
The "kegs" that Pam and Henry are trapped in are clearly plastic drums that have been painted silver.
When Bob McKenzie belches and blows the side off the large beer tank, one of the poles connected to that side is clearly visible moving before the rest of the wall, thereby pulling it off.
When Bob and Doug are downing their beers at the beginning of the movie, Bob is obviously not drinking any of the beer.
When Bob is being fingerprinted, the cop puts Bob's left thumbprint in the box that says "Right Thumb." The fingerprint sheet also says "Industrial" which does not seem correct for a police document.
Pam claims her birthday is on October 21st, 1959. However, the secretary claims that she just turned 21. If Bob & Doug were framed for kidnapping Pam on October 10th, 1983, Pam would be 11 days shy of her 24th birthday, 3 years after she turned 21.
At the beginning of the film, when Bob and Doug are running from the movie theatre, the shadow of the camera, crane and cameraman are visible for a moment on the street, next to the cop car they pass by.
When Bob and Doug arrive with the Toronto police at Oktoberfest, they are stopped by a Peel Regional Police officer. Oktoberfest in Kitchener-Waterloo is in the Region of Waterloo, and is jurisdiction of the Region of Waterloo Police Service.
Bob and Doug give the dog wrong directions to Kitchener by stating he needs to take Highway 6 off the 401. Highway 6 leads to Guelph, Highway 8 (further down the 401) goes to Kitchener.
When Claude is talking to Bob and Doug, and telling them about Pam's birthday party, and how to get to it, he refers to her as his daughter. Pam is actually his niece, and at most his step-daughter, now that he has married her mother.