- Continuity: During the shower scene, two bars of soap were dropped on the floor by the drain. When Duncan is shown standing over the drain, the soap is not there.
- Continuity: When Chuck and Larry are in the cab in Canada, Chuck's necklace appears and disappears between shots.
- Continuity: When Chuck and Larry go into Alex's office, her glasses case switches between open and closed between shots.
- Continuity: When Chuck meets Alex in the supermarket, she is wearing her glasses. In the next shot, she isn't.
- Factual errors: Cincinnati spelled incorrectly as "Cincinatti" on the picture in Chuck's house.
- Continuity: When Chuck is talking to Alex in the pharmacy, his necklace goes from being over his undershirt to under it several times.
- Continuity: When Larry has the Mets game on, Xavier Nady hits a 2 run home run and you hear Gary Cohen say 6-2 Mets. The next clip has Nady still up at bat and the score is 4-2.
- Continuity: As Duncan breaks into song during the shower scene and Chuck and Larry provide back-up vocals, Larry turns around to see him sing. In one shot from one angle, Larry is holding a bottle of shampoo. In a different shot from another angle Larry is holding a tube of body wash.
- Errors made by characters (possibly deliberate errors by the filmmakers): In the firefighter scenes, the firefighters are seen riding on the back of the ladder truck. Firefighters have been banned from riding on the outside of the trucks for decades.
- Factual errors: Chuck and Larry enter the burning building without using their face masks and air supply. No firefighters would do that, and they wouldn't last long breathing that air.
- Continuity: When Chuck and Larry are trying to get the obese man out of the fire, they are seen rolling down the staircase. Off and on, their SCBA's are on, then off, and continues until they come to a stop.
- Continuity: During the scene with the blow up doll, Larry knocks over a green cup behind him. That cup changes positions throughout the scene.
- Continuity: After the first house visit, when Chuck and Larry are on the porch saying good-bye to the investigator, the front door changes positions throughout the scene.
- Continuity: In the scene where the two spend their first night together in bed, the duvet on the bed toggles between neat and wrinkled throughout the shot.
- Audio/visual unsynchronized: When Chuck is putting a pillow case on his pillow and Larry says that's his underwear, you hear Chuck say 'NO!' but his mouth doesn't move.
- Continuity: During the scene where the other firefighters refuse to play a game of basketball with Chuck, as the firefighters are shown walking away, the character Nootzie's gray shirt shows a very light sweat stain. When they cut to Chuck and then back to the firefighters Nootzie's shirt has a darker, more pronounced sweat stain.
- Factual errors: The scene where Chuck and Larry extinguish a fire at a diner caused by an employee smoking marijuana, Chuck uses a fire extinguisher to spray that employee in the face. The extinguisher has a cone shaped nozzle which is indicative of a carbon dioxide extinguisher. This type does not leave any residue like in this scene which leaves a bunch of powder.
- Continuity: In the scene in the jail cell, when Larry and Chuck are looking out the window at the gay protesters, Larry is not wearing his jacket. However, when the camera angle changes to show him talking to the man, he is seen wearing one.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Factual errors: SPOILER: In the second wedding at the end, the wedding registrar says "on behalf of the Commonwealth of Canada." Canada isn't a commonwealth; its official name is the Dominion of Canada, or just Canada.
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