Most of Douglas MacKrell's videos are filmed in front of his bookshelf, which content changes over the course of his meetings.
- a Back to the Future-Delorean by Sun Star
- undefined Merchandise to Evil Dead the Musical
- "Book of Greek Myths" by D'Aulaire
- a book about art, most likely "A World History about Art" by Hugh Honour and John Fleming
- "Truffaut, Hitchcock" by Francois Truffaut and Alfred Hitchcock
- "Great Americans"
- the red book about "America" could be "Mysterious America" by Loren Coleman
- "An Alchemist's Primer: Fundamentals of Esoteric Transformation" by Manly P. Hall
- a picture with Scrooge McDuck in the design of his video game
- also a tuning fork in front of it as an illusion to the DuckTales-episode "Treasure Of The Golden Suns, Part 4"
- a figurine of Captain Crunch, most likely this coin bank
- a magnifying glass
- "The I Ching or Book of Changes" by Wilhelm and Baynes
- "Deadly Equines" by CuChullaine O'Reilly
- "You can communicate with the unseen world" by Harold Sherman
- "Great Tales of Horror" by H.P. Lovecraft
- a guitar leaning at the buttom right
After his puzzle challenge MacKrell added a few more books to his shelf.
- "777 and other qabalistic writings of Aleister Crowley"
- "The Areas of my Expertise" by John Hodgman
- "The Zombie Survival Guide" by Max Brooks
The last one was replaced in Dipper's Real Name Theory Debunked with...
- "The Quantum Leap Book" by Louis Chunovic
...only to be replaced again in the next meeting The Mystery of Pacifica Northwest with the previous "Deadly Equines". MacKrell also appended...
- "Seth Speaks" by Jane Roberts
...which was also gone the next meeting The Mystery of Gideon Gleeful. Added in "The Six Fingered Hand" was a yellow undefined book. Another unidentified book with a big 10 on its cover was appended in " Candy Monster".
" Stan's Tattoo" added two more things to the shelf.
- "Astrology: A history" by Peter Whitfield
- the Great Owl Rockytop
- a little yellow rubberduck
The Update Video 6/7/14 showed the lower shelf with a toy horse and rearranged a few books.
In The Mailbox MacKrell appended a photo he got mailed from a fan and in his Patreon Announcement a pressed flower.
Lefty had his "Book of Greek Myths" by D'Aulaire presented more prominent, MacKrell also added a book about UFOs.
- "Flying Saucers - Serious Business" by Frank Edwards
In The Tooth he appended two new books.
- "The Thrilling Adventure Hour"
- Book of Thoth
In Scary-oke two more books were added.
- "101 Spy Gadgets for the Evil Genius" by Brad Graham and Kathy McGowan
- "Reason to Believe: A Practical Guide to Psychic Phenomena" by Michael Clark
In Decoder Ring Depletion he appended...
- "Dinosaurs - Giants of the Earth" by Dougal Dixon
...and in The Secrets of Scary-oke the long-titled book...
- "Chakra Meditation: Discover Energy, Creativity, Focus, Love, Communication, Wisdom, and Spirit" by Swami Saradananda
- a painted My little Pony-figurine MacKrell got for his Creative Contest
Into The Bunker showed us this Collection of short storys.
- "Alfred Hitchcock's Supernatural Tales of Terror and Suspense"
In The Secrets of Into The Bunker he added another two books.
- "The Unexplained: An Illustrated Guide to the World's Natural and Paranormal Mysteries"
- "The Field Guide to Lake Monsters, Sea Serpents, and Other Mystery Denizens of the Deep" by Loren Coleman
Two new books were appended for The Golf War...
- "Amazing America" by Jane and Michael Stern
- "Signs, Symbols & Omens: An Illustrated Guide to Magical & Spiritual Symbolism" by Raymond Buckland
...and two other for Puma Shirt Panther Shirt Phantom Panther
- "The History of Freemasonry" by Albert Mackey
- "Tales of the Cryptids: Mysterious Creatures That May or May Not Exist" by Kelly Milner Halls
In The Blindeye Society MacKrell added
- "New Roadside America: The Modern Traveler's Guide to the Wild and Wonderful World of America's Tourist"
It's not his shelf, but in Creative Contest Winners we get to see MacKrells Mac and also...
- a cup from Confusion Hill
- a model of Tom Servo
- three TMNT-figurines
- the winning owl-figurine
In the meeting MONSTER OF THE WEEK versus MYTHOLOGY EPISODES two more books were added.
- "The Field Guide To UFOs: A Classification Of Various Unidentified Aerial Phenomena Based On Eyewitness Accounts" by Dennis W. Stacy
- "Dipper's and Mabel's Guide to Mystery and Nonstop Fun" by Rob Renzetti and Shane Houghton