Continuity mistake: In the scene just after Joe finds his parents, when they are sitting in their trailer talking, his parents have a stuffed clown between them. Just before Joe asks them if there ever was a time when they'd be staring at the moon, the clown is slumped forward with its face not visible. In the next shot, when his mom starts her sales pitch about having clowns for sale, the clown is now standing upright between them.
Continuity mistake: When Joe spins the tires for the security guy, The tire that's supposed to be spinning is on the left side. But after Joe says "does this look like a piece of crap to you?" It shows the right side spinning on close up 3 times, But when they show a wide shot of the car the right side is not spinning at all and the rubber burns are on the left side of the car.
Revealing mistake: When Joe is strapped to the atom bomb he orders a girl to show him her boobies. When she takes her top off, you see a back shot of her (so you can't see her boobs) but her body is transparent and you can see Joe's arm through her body. Obviously, the girl was superimposed onto the shot.
Continuity mistake: At the end of the movie when Joe, Brandi, Kickin' Wing, Gert B. Frobe, and the alligator girl are in his car, Robbie pulls up along side of them. Joe pulls out, spinning dirt and rocks toward Robbie's car, and a camera shot from inside his car shows Joe's car speeding away, and the windshield is completely clear. But in the very next shot, from in front of Robbie's car, the windshield is broken, and has 2 places where it appears as if large rocks had hit, but they weren't there seconds before, and the dust and flying rocks had already begun to clear by that time. It is illogical for a rock large enough to do that kind of damage to his windshield to have suddenly kicked up, judging from the distance it shows Joe's car away from Robbie's in the previous shot.
Continuity mistake: Near the end of the movie Joe wakes up at Brandi's house and they run out to find Joe's "hemi" sitting in front of the house. The camera shot shows the car from the right side, and you can see the rear-view mirror attached to the windshield. And shortly afterward when they all get in Joe's car, another camera angle shows the mirror as well. But when they're speeding away from the house the camera angle from the front of the car shows the mirror is no longer there.
Continuity mistake: In the oil well scene during the fight, Joes coveralls have a bright clean patch on the back, but when the bad guy throws him to the ground the patch is dirty, a few seconds later as he kisses the girl and shares his skoal with her the patch is clean and bright again.
Plot hole: The scenes involving Kickin' Wing, Clem, and the radio station are supposed to be years apart. When Joe is driving to the Hall of records, Kickin' Wing states that the incident was "more than ten years ago." Joe was abandoned in 1979, meaning this scene takes place between 1989 and 1993. In the scene where Joe denies that he saved the kids (from the gas), he refers to the incident as "15 years ago" meaning the scene takes place in 1994. By the time he gets to telling his story on the radio, it is 2001, and curiously, Joe never seems to age at all in between that time.
Continuity mistake: After being captured by Buffalo Bob, Joe Dirt is put in a large hole, where Bob forces him to rub lotion all over himself to skin him in exchange for giving him Auto Trader magazines. Joe is reading one right before the police come, but when the shot changes, it has disappeared.
Factual error: At the end when Joe, Brandy, Clem and Charlene, the alligator woman are in Joe's 1967 Plymouth GTX, Robby claims his car is faster. Charlene chides back about his Trans Am, saying 'you think you can match that little old slant six against his 426 Hemi?" Pontiac Trans-Am's did not come with slant sixes, a Dodge motor. His was obviously a V-8, and would have most likely have been a 400, but we get the 'yours is really small' reference.
Continuity mistake: At the end of the film as Joe and "family" are getting into the convertible, Christopher Walkens' character starts to get into the car and has one leg fully into the car, the next shot shows him still a few feet from the car and starting to lift his leg into the car.
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Factual error: In the scene where Joe Dirt is talking to the sales rep at the dealership about who ordered the Rambler wagon, the sales rep mentions it came with a 258 cubic inch engine. No Rambler ever came with the 258 six. American Motors (makers of the Rambler line) came out with the 258 in 1971, 2 years after the last car with the Rambler name (the Rambler American), was sold in 1969. Although I was impressed that they bothered to mention an actual American Motors engine, it's still not correct.
Revealing mistake: When Joe is on the bridge and about to jump, the cop ropes him with a bungee cord. It's a single-stranded cord with a loop like a lasso. When Joe falls, however, it is a multi-stranded bungee cord with a proper ankle wrap. Obviously, it wouldn't be safe if the stunt man jumped with just a lasso, but it's obvious that it's two totally different ropes.
Other mistake: When the old man gets his foot caught in the railroad switch, the switch closes on his foot, trapping him. As the camera pans out we see that this was not an electric switch but a hand throw switch, meaning that someone had to be standing at the switch manually operating it to close on the old guy's foot.