Missing scenes.... ?
I remember seeing this movie when i was a kid, and it had some scenes that i remember clearly, but aren't on the dvd, at least not the one i have.
The first one is when Steve Martin and his evil wife are in the car, and he hears the "brain" calling for help. So he steps on it, rushes back home and finds he left her (the brain) in the sun light. So he asks her to say the alphabet. She does so, but forgets the letter Z. He asks her how is called the animal with black and white stripes, and she says "a ebra". Then he asks her where they keep it, and she says "in the oo". So he says sadly: "The sun burned your Z cells." Then his wife walks in asking him wtf was his problem driving like a maniac, and she is totally grossed out from seeing the brain. I think she says "it looks like melted tapioca" or something similar.
Another scene is at his demonstration in Austria, where he opens a dead body's head and finds 3 lemons instead of his brain.... i remember someone from the audience gets up and starts yelling at him in german (i didn't know german too well then, so i don't know what he said) anyway, the guy looks really pissed and is threatening him or insulting him.... then steve asks another guy beside him what he said, and the other guy translates for him "Welcome to our country, have a pleasant stay, we admire your work very much, etc etc...."