New this month Continuity mistake: When Cartman visits Chris Hanson to call off his appearance on Dateline (he is currently unable to keep from blurting out his unfiltered thoughts), he lies that his grandma died and that he has to go to Memphis. His "Tourette's" then kicks in and he admits that his grandma's fine. His grandma, however, died earlier in "Cartmanland" (season 5 episode 6) and at this point, he knows of only one parent (his mother/father Liane).
Continuity mistake: In the episode "Cat Orgy" when Sheily's boyfriend, Sklar, are playing the song for Sheily while Cartman is hanging on the coat rack you can see of what looks like a picture of Cartman's grandparents hanging on the wall. But when Sheily walks over and flings Cartman up into the ceiling for arguing with her, look at the wall, the picture is completely gone.
Other mistake: When the boys cause a mini tremor by blowing up the girls' base, the time at which it occurs is strange because when they do it, both Stan's parents are at home (even though they both have jobs), Ms. Choksondik and Mr. Mackey are at Choksondik's house getting it on (indicating that school is over) and the other teachers are still at the school.