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"Cybergraph Stadiam" - I believe this is supposed to be a large stadium for playing holographic Atari and Nintendo games.
"Gaurds" - Of course, a crack corps of guards should always be on watch to protect my comic book collection from invaders! I especially like the bathroom with the two toilets - perhaps one is a bidet?
Carl's Jr. - Across the hall from the guardroom is a Carl's Jr. where the guards can get fried zucchini with ranch dressing 24/7. Keeps up morale.
Secret Comic Book Room - In the back corner of the library is a secret door to the best comic book collection in the universe. Note the gigantic bean bag in the middle of the comic collection to recline upon while reading Doctor Strange or ROM Spaceknight.
Dungeon With Pet Dragon - Of course! You can even see the manacles on the wall!
Stables - Stables preferred over a garage because (1) horses are cooler than cars, and (2) it's illegal for 11-year-olds to drive in California.