Proper Condom Use

Goofs

 * The child who was shot with a nail gun is first shown with brown hair, but in another shot, has red.
 * Clyde has a different father in the episode.
 * When Mr. Garrison is talking about condoms with the kindergartners, Ike doesn't have a mouth.
 * While Butters is putting his condom on, he reads the instructions, but Kyle's voice sounds like Butters' when he asks him a question directly after.
 * When Cartman says "Red Rocket" as he and Kenny shows Stan and Kyle how to "milk" a dog, his mouth moves but he doesn’t speak. This was later corrected in the Comedy Central reruns, but not on the season five DVD.

Hidden aliens

 * Two aliens' ghosts watch Butters put the condom on.