When Emilina is attacked in the bathroom. At first the shower curtain is completely over her attackers head, when she pushes backward, it cuts to a scene where they are both falling backward, and the curtain is gone, when it cuts back to them in the shower the curtain is back, but not around her attackers head.
The girls in the hall and the hip hop dancers on stage while Shawn and Gus were on the catwalk, both shared the same contestant number 43101. This is not a goof, however: the two are a duo, and in the show, all contestants have the same number as their partner. Shawn and Gus have the same number as well.
While leaving the bathroom Sean, is clearly seen turn the light off and on by way of a light switch. When Sean and Gus return with Julie it may appear as if the the light comes on its own as they enter the bathroom, but in fact it's Gus reaching back with his left hand and flipping the switch as they enter.
While having dinner at Henry's house, a steak is seen on Shawn's plate before Henry serves it to him.
For being a super observant person Shawn completely misses noticing in the bathroom that the shower rod doesn't have a shower curtain on it.