When Stanley is filling up his water jug for the first time, he looks over to Armpit and says, "Thanks Armpit." In the next shot, Armpit throws his hand out and says, "Man, whatever," but his mouth never moves.
When Zero and Stanley are digging their last hole, they go in a hole that is of equal height on all sides. When they are digging, in the background you can see a ramp that has been dug with steps going up to ground level. There is no way two boys could have carved those steps out of the dirt in that amount of time.
When Stanley's grandfather is talking to him at the dinner table he has two band-aids on his face, one on the chin and one on the forehead, but later when they go back to that scene, both band-aids are gone.
When Zero talks for the first time in the dining hall, Armpit is in the background leaning over looking at him. Armpit starts talking while he is still in the background not moving his mouth. In the next shot he is sitting straight up.
When Stanley has finished digging his first hole, in the overhead shot, you can see his shovel on its side on the ground - and his canteen is not there. When he climbs out, his canteen has suddenly appeared next to his shovel.
During the first dig scene, Zero finishes digging his hole before anyone else. As he jumps out of his hole (heading back to the tent or 'wreck' room), he has his goggles on. In the next shot (only seconds later), he passes by the group and his goggles have completely disappeared.
When Stanley steals Mr Sir's truck and turns the ignition, Mr Sir turns towards the truck quickly, and begins to move towards it. In the next shot, we see him facing away for a second, then turns his head to the truck again.
The time-lapse motion of stars during night scenes is incorrect for Texas. They arc from right to left, but it should be left to right if looking at the southern horizon, or they should rotate *around* the North Star (counter clock-wise) if looking at the north horizon.
The American Flag is on the wrong side of the judge, as it is accorded the place of honor, always positioned to its own right, or the speaker's right and the audience's left, according to the United States Flag Code.
After Stanley digs his first hole, he shows severe blisters on his hands. When he is leaving the showers after he gets back, Mr. Sir tells Stanley not to move while he shoots a yellow-spotted lizard. When Mr. Sir tells Stanley not to move, Stanley holds his hands up, palms out, with no blisters or damage of any sort. Later, Stanley reveals his blisters from the first day.
The goof items below may give away important plot points.
Kissing Kate Barlow dies by getting bitten in the arm by a yellow-spotted lizard. Afterwards, in a shot from the side, when the lizard crawls further up her arm, you can see that there are no bite marks where the lizard bit her just seconds earlier.
Towards the end of the movie when Zero and Stanley climb out of the lizard-infested hole, Zero is carrying the trunk and the Warden is trying to grab it from him. In the background you can see two crew vans.
Mr. Sir says that if one gets bitten by the yellow-spotted lizard, you die slowly. Although when Kissing Kate Barlow gets bit by one, she dies almost instantly. She is seen to be very weak and the poison was able to work faster.