When Bubba is in the sauna in the girl's locker room, he watches a girl with long dark hair held back by a chrome barrette leave the shower with a blonde girl, go to her locker, and dry off to get dressed. When he turns and looks toward the shower, the same dark-haired girl can be seen in the shower again.
When the three boys fall outside the dorm window, they land on an air mattress covered with leaves, made to initially look like the rest of the dead leaf-covered ground under the window. You can see the whole mattress move when they land, and the leaves are mostly blown off by their landing, and after that you can see the mattress.
At the beginning when Jim, Roy and Bubba are standing atop each other to peek into Jordan's shower, you can barely see the wire supporting Michael Zorek's (Bubba) right shoulder, and you can see the wire pulling on his coat.