You can natas spin on the head of the guy on the motor bike in tony hawk underground.
There's a hidden rail in the gym on the school II map in thps 2 and if you grind it the textures in most parts of the map disappear and if you keep kissing the rail you get out. I had the skip to start cheat on and tp'd to the gonz rail and it reset everything. pretty interesting.
On the Playstation version of THPS1 you can grind all the way around the quarter pipe, and at the end you get a gap called "Holy Shi..." for whatever reason in the N64 version it just says "Holy Cow". nintendo freakin' made BMXXX (on some versions it's censored) and some other games, but that's just dumb. contradictory much?
There's a freecam mode in THPS3.
If you play as demoness in the suburbia map in thps3 and ride over to the thin man he falls in love with her.
If you ollie into the front door of the house in suburbia as demoness it says "Welcome home". I guess what's beyond the door is hell.
If you manage to break all of the glass in the greenhouse on the cruise ship, the intercom plays this:
"Aha!" [two men fighting over the intercom] [glass breaking and screaming] "You, yes you! Skater down there! You have shattered the glass and set me free! From the fiery depths I have returned! The true Captain Jennings! That... imposter (among us go brr) will not be bothering us anymore! [evil laugh >:3] Uh.. yes.. for your diligence I offer this bit of advice: uh.. eh. Don't.. jump in the water! It's wet! Uh, thank you."
8. In the NYC level on THPS 2, if you wait a while you can hear a lady scream.
9. In THPS 4 if you try to knock down someone who's female you just get pushed down by them.
10. Did I mention that most of the THPS 2 soundtrack is literal garbage?