Ghostbusters: The Video Game

Go upstairs at Ghostbusters headquarters. You can find a drawing by a child on pink paper hanging near some electrical equipment. The text "To Uncle Egon, from Ed." Appears on it. This is a reference to the fan fiction Ghostbusters videos "Freddy vs. Ghostbusters" and "The Return Of The Ghostbusters" which features Egon's nephew Ed Spengler.

In the museum, when you are chasing the Chairman with Alyssa, you will enter an exhibit that shows the burial customs of the Gozerian Cult. Once you enter this room, immediately turn to the right and you will see three portraits in the dark. Use the Stasis Stream to illuminate the painting. You will see a skeleton creature kissing a woman, but he has pulled up her dress and appears to be touching her.
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In the HQ, walk to the windows on the back left and you will see the doors from the Ecto 2 along with the logo from Ghostbusters 2

• In front of the water fountain in the firehouse is a window looking back into storage. You can see the "Ghostbusters II" sign and some doors from Ecto 1A.
  

• When you are in the firehouse just before returning to the closed-up Sedgewick, play through the phone messages. You will hear a woman asking for the number to Ray's Occult bookstore.
  

• When you are in the hotel ballroom with Slimer, press [Action] by the piano to sometimes hear the same notes that Peter played in Dana's apartment in the first movie.
  
• In the Sedgewick Hotel level, you will pass room 1204 while hunting for Slimer. Inside you can hear the original Ghostbusters commercial from the movie. This is also a reference to Dana Barrett, who had a habit of leaving her television turned on too loud.