Continuity mistake: The opening scene in the shopping cart must have been filmed in two places. At one point you can see the end of the road, which is just a brick wall, but they crash into a market.
Continuity mistake: In the opening credits, the guys are standing full depth in the giant shopping cart. When they get to the bottom, the cart most noticeably has a platform halfway down that the guys are standing on when they get thrown out. [It is mentioned on the cast commentary (by Bam) that they needed to raise it up because they were afraid of jumping out from so low down in the trolley. Still a mistake, but that's why it's there.]
Continuity mistake: In the old man scene, the house that lands on Knoxville goes up with nothing on the side of it, then when it lands on him, it has the jackass symbol on the same side.
Continuity mistake: In the opening shopping cart scene with the cast, you can see on a wide shot that Wee Man is in between Johnny Knoxville and Bam Margera, but in the next scene when Bam hits Dunn you can see Wee Man is sitting in the front of the cart in the seat, in the next wide shot Wee Man is back in between Knoxville and Bam again.
Continuity mistake: In the scene where Ehren makes the yellow snowcone there is a editing mistake. In one shot, his snowcone is almost gone. In the next shot, his snowcone is barely eaten.
Continuity mistake: When Ehren McGhehey is eating his yellow snowcone and is holding it above his head so he can catch the drops, which are dripping from the bottom of the cone, there is a good amount of snow left in the snowcone, but in the previous shot there was almost no snow left.
Continuity mistake: In the burglar scene Bam has no hat on. After they crash through the ceiling, still no hat. As Bam is picking up the diamonds, right after Johnny slaps him, a hat appears out of no where. Then as they run out, Bam has no hat again. Yet when they exit the building, Bam's hat is back on.
Chosen answer: It's Carl Orff's classic composition "Carmina Burana". It's most prominent use was in Excalibur (1981), other movies to feature it include Detroit Rock City and General's Daughter (both 1999).