Factual error: Murray and Barry go to a Philadelphia Flyers home game. In the episode the Flyers are wearing orange jerseys. In reality the home team wore their white jerseys in the 1980's. When they watch the replay of Ron Hextall's goal on TV, you see the Flyers wearing white. (00:05:00 - 00:06:00)
Factual error: In a previous episode, Adam's uncle gives him a power glove and they talk about "The Wizard" which came out in 1989. A few episodes later, they talk about Reagan getting reelected, which happened in 1984.
Factual error: At the very beginning of the show, they are standing in line to watch the movie ET in "1980 something." The kid starts asking if Yoda was just a puppet and if ALF was just a puppet. ET came out in 1982. ALF did not come out until 1986. Later in the show, they mention Kokomo by The Beach Boys which did not come out until 1988. ET was out of cinemas by then.
Factual error: In this episode Adam and Barry are mocking Erica for being a fan of New Kids on the Block when she was younger - she must have gone off them pretty quickly as NKOTB only became well-known outside of Boston (their home city) on the release of their second album in 1988.