When Tommy suggests going to the Factory to find out what arcade games they had in 1989, Merton tells him that he didn't travel through time to play Donkey Kong (1981).
After changing history, Boris says, "Look at bright side. Thanks to my information, future Americans no longer disappointed by unsatisfying 'Star Wars' prequel."
In the alternate timeline, Dean watches a show called "Comrades". He says, "This is the one where Ross and Rachel redistribute the wealth of Monica's apartment...Oh no, it's Ugly Naked Proletariat Guy."