In Lenny and Squiggy's apartment, the curtains and the tablecloth are made of the same pattern material as the furniture and curtains in the Cunningham living room on the TV series "Happy Days".
The dogs seen coming up the steps outside of the apartment building after the scene at the brewery appear in the Happy Days episode "Spunkless Spunky" (Season 5, Episode 19). The white dog is Fonzie's dog "Spunky" and the other dog is the neighbors dog from the end of the episode.