I notice that on episode 45, Liz and Lisa, in the beginning, are hurrying to buy something. Christine says, "What are you gonna buy?" And Liz says, "We don't know!"
Technically, shouldn't they both have been slimed?
In Christine's intro in episode 45, She says "I don't know why I say that..." and she didn't get slimed.
And in a recently displayed episode, Christine, in her intro, says, "I don't know about you guys, but..." and she didn't get slimed then either.
I'll bet there's a lot of other episodes like that.