Whenever the movie theatre is shown, look at the movies playing. One of them is "The Last Temptation of Christ", a movie in which Jesus lives in a world where he wasn't crucufied and sees what would have happened had he not died. Sort of the same idea...
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A reflection of Ronald Reagan can be seen while a right wing teacher rants on and my favourite; Amnesty International being listed in the credits for apparently no reason (I know this is an egg as Richard Kelly mentions it as an egg himself)