In the future a sign can be seen saying "Give apes the vote! You wont regret it!", a reference to the apes in this film who took over Earth and enslaved men in the future.
Moe and his clone encounter a Moe/spider who then says "What? A spider got into the cloning machine" -a parody of the fly who got into the cloning machine in this film and had his D.N.A. mixed with the subject.