When Barry is flipping through his baseball card album, on the second page of cards, in the middle of the bottom row is Jeff Garlin as a Phillies player.
The song played during the ending scene is 1987s, "I Think We're Alone Now", by Tiffany.
Erica is seen wearing a t-shirt depicting the cover artwork of The Cure's 1986 single, "Boys Don't Cry (New Voice New Mix)".
This feud apparently lasted 8 months. It started on April 1, 1989 until November 9, 1989. That is when the Berlin Wall came down.
When Erica is singing at the end of the episode Murray tells Beverly that she isn't going to be a Momiger. That was definitely not a term used in the 1980s and became a thing thanks to Kris Jenner who made the term popular.