While Ray and Winstone still fit into their old uniforms from The Real Ghostbusters (1986), Ray now wears the same dark Grey style jumpsuit as Egon wears in this series, resembling the alternate outfits briefly seen in Ghostbusters II (1989).
When Egon says the bust was "Reminiscent of the time we busted that Class 4 Shape Shifter in the Poconos.", he is referring to events from Drool, the Dog-Faced Goblin (1987).
After Janine tells the crew that they have a call in the Hell's Kitchen area, there is a shot of ghosts in the sky, which is reused footage from The Pied Piper of Manhattan (1997).