Continuity mistake: In the scene where Pauly Shore and Stephen Baldwin's girlfriends arrive right after Baldwin is smacked in the face with the encyclopedia, Baldwin is shown lying on the ground directly above his face, and off to the side. When the camera is off to the side, his braids are in his face, but when they are directly above him, his braids have been brushed away.
Continuity mistake: As the professor is showing Bud and Doyle around the Bio-Dome he takes them onto a raised platform. From the wide shot we see that his scarf is not on properly and is draped over one shoulder and hanging down his back. In the close up shot as he turns round, it is back on properly.
Continuity mistake: When Doyle throws the cup on the ground, Bud picks it up and gets the proof of purchase. The camera angle changes and they are dancing and Bud no longer is holding the proof of purchase.
Continuity mistake: When Bud and Doyle are talking to their girlfriends from within the Bio Dome, you see Monique from behind standing with her hands at her sides, the camera angle changes and you see her hand on the glass.
Continuity mistake: In the scene where Mr. Leaky is showing Bud and Doyle the t-shirt, Bud is sitting on the chair normal, but when the camera view changes to their backs, Bud is sitting on the chair backwards.
Continuity mistake: When Bud and Doyle are being shown the T-shirts by Mr. Leaky, the camera angle from the front shows them sitting close together, but the camera angle from the back shows them sitting much further apart. Happens about 3 times each time the camera angle changes.
Continuity mistake: In the scene where Bud hits Doyle in the head with the encyclopedia, Doyle slams in to the shelves behind him consequently destroying them and knocking everything on to the floor. However, in the next scene, when Bud brings the girls in to see the injured Doyle, the shelves are whole again.