wow....... this show is famous for an absence of continuity, a spelling error bothers you that much? it's not a continuous show, it doesn't have continuity, some things have been written in stone but most stuff is amorphous....
(Lisa)"we'll just call you snowball II and forget this whole thing ever happend" (Skinner)"Isn't that a CHEAT young lady" (Lisa)"I do believe it is, principal TANZARIAN" (Skinner)"Carry on" there has been so many cheats in that show as well as Futurama...its horribly bad...like how come Bart is a successful business man when Lisa is about to get married [and he is bald] but when Lisa is president, he has hair and he is a loser who hangs out with Ralph... this is about all i discussed for the last half of the year in calculus class