Photos of the younger photos of 'Pops' were in fact real photos of George Segal as a younger man
Actor Jonathan Schmock as auctioneer Amdee Zukkunda, appeared in Ferris Bueller's Day Off as the Chez Quis Maitre D'. It is established that both Barry and Adam are huge fans of the movie, in the season 2 episode Barry Goldberg's Day Off.
Adam is seen wearing an Inner Space T-shirt,which came out in 1987 so 1980something must be after that.