Janey: Jake! How did you get in here? I thought Dad bolted the door.
Jake: There's a big hole in the side of your house.
During the detention scene, the teacher comes in and you can see there isn't anything on his rear end. As he leaves, you can see toilet paper hanging from his rear. This was because a scene never made it into the movie where the teacher's office is in the mens restroom. Also confirmed on cast commentary.