So where did they get the money from for that house?
I forget if they said one of them inherited the house, money for the house or won the lottery.
YEAH, BITCH! MAGNETS!
It's alluded to early in the movie that Zahn is "accidentally rich." I don't think it's ever specified how that happened, but the idea is that he's wealthy. Possibly via some sort of lawsuit.
Prof. Farnsworth: Oh. A lesson in not changing history from Mr. I'm-My-Own-Grandpa!