Continuity mistake: In the scene when Harold and Kumar go into the girl's bathroom and hide in the middle stall, you can see all of the stall doors are closed. When the twins are standing at the mirror in the bathroom, you can see in the mirror that the stall door behind the twin in pink is open, and then it is closed again. (00:23:45)
Revealing mistake: In the Arena Challenge scene, the statue of Toa Lhikan falls on the herd of Vahki and part of the statue's mask is going through the ground. (00:22:30)