When Charlie Sheen is travelling down the river, and is saying the "someone once said that hell is the imposibility of reason" speech, It is exactly the same speech that he says in the film Platoon.
And not only that, he passes his father, Martin Sheen,...
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In the very end of the credits of the sequel to Hot Shots there is a statement which has been placed in but is backwords on film. If you record it off the TV and reverse it on your computer you will find that it says "The load has been demolished"