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I think what Emily means re Zaphod's heads is that they only gave him one.
Well, he does have two heads, but the second is underneath the first, as opposed to just being next to it, like it was in the books. IIRC, he put a birdcage and a towel over it at the party where he met Trillian and pretended it was a parrot.

I believe there's a hero in all of us that keeps us honest, gives us strength, makes us noble, and finally allows us to die with pride, even though sometimes we have to be steady and give up the thing we want the most. Even our dreams. -- Aunt May, Spider-Man 2