When Morty is showing Michael how to use the remote, Michael rewinds to a family vacation in 1976. A childhood friend of his invites everyone over to his parents' RV to watch Three's Company. Three's Company didn't premiere until 1977.
When Michael wakes up in 2017, Mr. Ammer says "Goods News, Eric Lamonsoff killed himself." Eric Lamonsoff is the main character in "Grown Ups" played by Kevin James.