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.
Other mistake: When Rowan Atkinson is riding in the train, near the end of the film, he is looking out the window. He is looking forward, then quickly looks backwards. He does this several times in a row, as if trying to see things quickly as the train passes them. But, when the camera pulls back, Rowan's back is facing the direction the train is moving, thus he was looking the wrong way! You can tell by the way the scenery is moving as you look through the window.
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.
Factual error: In the beginning of the movie when the main character is watching ESPN. The footage of the Dallas game, where the referee (Cuba Gooding) messes up the coin toss, you clearly see the sky right over the crowd in the stadium. The ESPN people say it was in Dallas. In Dallas, the Cowboys play in a dome. The hole of the dome is in the center of the roof and the sky would not have been shot so easily. Also the dome has artificial grass. The footage showed natural grass.
Factual error: When it shows Cuba Gooding Jr.'s botched coin flip call, he is wearing a black hat with white stripes. This hat is only for Line Judges, Back Judges, and Umpires in football. If he is doing the coin flip, he should she be wearing a white hat to signify that he is the referee. The referee wears the white hat in every level of football, from high school all the way to the pros.
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: 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.