When the girls first get their cabin assignments, Penelope says that Cabin C is for Little Kids (10-year-olds). Later, when Cinder is taking the bets, a much-older girl hands her money and says that Cabin C is betting on Ferris to win.
The first time Angel and Randy go to the boathouse she picks him up in a tan canoe. When they pull into the boathouse the canoe is green.
In the bus fight scene, a short girl with braces is seen near the back of the bus. In the next shot, she is in between the fight and the front of the bus.
When the bus is on public roads, it has license plates. When it is on private property (the camp, the parking lot where they meet their parents, etc) it has no plates. The plates on the bus appear and disappear multiple times during the initial bus ride because of all the different places the bus is seen.
The color of Ferris' blouse changes from purple to pink in the course of the food fight sequence.
The first time Angel and Randy go to the boathouse it is night time. At one stage Angel is beginning to undress and there is a window behind her. You can clearly see outside that the filming was done in broad daylight.
When Randy says "Oh, man," when first meeting the girls, his mouth is not moving.
While in the restroom, Cinder tells the others, "I was the 'before' girl in the Tidy Tangles Creme Rinse commercial." Later in the cabin, when offering up her residual check, she says, "Compliments of Tidy Curl" instead of Tidy Tangles.
When Randy first meets Angel, he says he's from 'Tamp Comahawk'. She later says 'You're drunk', which might explain his mispronunciation of Camp Tomahawk.