Page One
*Poughkeepsie is mentioned (maybe Burnham enjoyed the sound of that place, too)
*The Spates Catalog symbol is still visible in the Ray's Occult storefront
*To the left of Ray is the Mink coat from Ghostbusters II
And two more Cursed Artifacts in Ray's Occult - Portrait of Eleanor Twitty, Archangel's Bladder - to add to the Portrait of F. Sedgewick and also the Spiderwitch calendar pin up. Peter must have not paid for his book neither.
Page Three
*The fountain is the head of Blacky, as the Guardian from "The Long, Long, Long, etc. Goodbye"
Page Four
*Ted and Annette Fleming from Louis' party in Ghostbusters are outside the diner
*As Mr. Burnham confirmed, the diner is an homage to Edward Hopper's Nighthawks
*El's Diner and El are from "The Man Who Never Reached Home"
*The patron next to Ron appears to be a human version of the bus driver ghost from "Ghostbuster of the Year."
*On the wall is a photo of Uncle Horace from "Who's Afraid of the Big Bad Ghost?"
*The "crime down 30%" newspaper is from "Ghost Busted"
*I saw this in the preview thanks to the magnification, but inside the newspaper, Gozer's "Choose or Perish" quote from Ghostbusters is embedded.
Page Five
*Behind Ray are stuffed dolls of Azetlor from Ghostbusters: The Video Game/Stylized Version, Stay Puft, Lizardo from "Attack of the B-Movie Monsters," Copycat in burger form from "The Copycat," Genie in its true form from "Janine's Genie," and the H2 Ghost from the Kenner toyline
*That monkey a throwback, too, or the Fantastic Land mascot?
*Peter pulls Ray's ear to get the truth like in Ghostbusters II
*The ride behind Peter looks familiar, might be from "The Bogeyman is Back" or "Ghostworld"
Page Six
*Venus fly trap might be from "Loathe Thy Neighbor"
*A Murray the Mantis doll in the stand, from "The Revenge of Murray the Mantis"
*Ray mentions the Boogieman
Page Ten
*What I think is the entrance for the transmogrified Big Apple Amusement Park in "The Bogeyman is Back"
*The Pillar of New York from "Beneath These Streets"
Page 11
*Possibly the Sorta-Kinda Tree from "Knock, Knock"
Page 21
*Rachel went to Columbia University after all
*Cult of Gozer insignia looks the one on that T-shirt
*Gozer photo might be from Tristan Jones' Tobin's Spirit Guide art awhile back
Page 22
*Mention of Cult of Gozer, Ivo Shandor, and the Gozerian Codex of Ghostbusters: The Video Game fame
*Mount Sinai Hospital mentioned
*Felix's last name a reference to Clark Ashton Smith?
Page 23
*Mention of John Horace Tobin
*Also mentioned is Heironymus Van Aachen from "Egon's Ghost"
Cover A
*Zunk from "Ghosts R Us"
*Hotel Boudreaux brochure from "Play Them Ragtime Boos"
*Stay Puft doll
This Post Contains Spoilers