Continuity mistake: When the two brothers are frantically trying to get out of the car because the monster truck is barreling toward them (in slo-mo), you will notice that the tongue ring is missing from the one brother's tongue. Odd mistake seeing as his character is centered around the tongue ring. (01:27:05)
Continuity mistake: When Tracy visits her boyfriend in the helicopter, she starts to throw random objects at his truck. Watch her first throw where she cracks the back window, you'll notice that the front bonnet is dented although nothing has hit the bonnet yet. If you believe something might have been thrown before that, when she throws the second and third object there is no dent where that one was. (00:46:25)
Continuity mistake: At the Monster Truck Rally, the blue convertible that they are driving has no dents or scratches, it looks perfect. But in the scene before that they are doing nosedives into the dirt while chasing the hot air balloon. You can clearly see the damage then. (01:03:10 - 01:27:30)
Continuity mistake: When Merril and Vera ask the squirrel lady for directions, she tells them to drive 1.8 miles to the Totem Pole ranch, and to then go 5.4 miles until they get to a yellow sign with graffiti on it. However when they get to the yellow sign with graffiti on it, Merrill says "OK, we're at 2.4 miles" - it should be 5.4 miles.
Continuity mistake: When Tracy is throwing things at her boyfriend's truck, you can see two dents in the roof. However, when Tracy is chasing her boyfriend, there is no damage to the roof.
Continuity mistake: In the helicopter chase scene you can clearly see that the metallic pickup truck had suffered serious grille and bumper damage, but in the scene when they arrived at the service station the front appears to be undamaged. (00:47:00 - 01:15:45)
Continuity mistake: Blaine's tongue piercing disappears at the airport, when he's trying to run away from the car, he screams and you can clearly see that the piercing is not there. (00:31:05)
Continuity mistake: At the end when everyone is dancing with Smash Mouth, just before Randy plays the harmonica Vera is singing with the singer of Smash Mouth, then in the next shot she is dancing behind Randy as he plays, and then in the next shot she is back dancing with the lead singer. (01:40:10)
Continuity mistake: When all the characters get to Silver City and get to the locker room, we see Seth Green in the background and the dude with the tongue ring in front leaning on the door frame. The next shots shows Seth in the front and the tongue guy behind him saying he's sleeping. How did Seth get there so fast? (01:32:45)
Continuity mistake: In the Balloon Chase scene, if you watch the sky it changes a couple of times. One time it's overcast, the next it is evening and the sky is orange. (01:02:25)