Corrected entry: 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).
Corrected entry: When Mr. Marsh is being taken away outside the lodge, the leader of the ninjas asks him who he gave the rabbit to. When Marsh won't tell, the man says, "Search the area, the boy [Stan] could not have gotten far." But seconds earlier, he did not know that Stan had the rabbit.