Was voted #4 on Ten South Park episodes that changed the world. Despite this Trey Parker and Matt Stone consider it one of their least favorite episodes in the series.
"Crab people" was an idea that the writers had joked about for some time, saying that if they ever didn't know how to resolve a story, they would just make the bad guys crab people. They ended up actually using the idea here.
The stores Forever 16 and Marcy's are a parody of the retail stores Forever 21 and Macy's.