Venice Beach 1080 - Must use Helium. Go down from the starting line and back up to see a wall with the Helium painted on. Back into it and knock it down to back into a room with a squirrel.
EDIT: Compile prior posts:
Stonehenge - Gently roll backward or forward to get underneath the start line and roll over the squirrel button. If rolling backward, watch out for rocks falling over. Continue on to check point 7 (possibly requiring 0 faults), then roll backwards and fall down into a mini track.
Lumber Party - After checkpoint 13 wait on the roof as the train starts going by. A squirrel is on the fifth (or so) car.
Happy Camper - After checkpoint 9, roll back underneath CP9 and a squirrel is in the campfire.
Alcatraz - After checkpoint 11, drop down and roll back. You can see the glow beneath the floors immediately after CP11.
Yellowstone Caldera - After checkpoint 7 there is a waterspout down the ramp that'll shoot you up. Bail out near the peak of this and go forward to a hot air balloon with a squirrel.
Wingman - Immediately after checkpoint 11 drop down to a platform below and back up to a fire ring. Proceed to go through another 3-5 rings and the squirrel will be under a blue platform.
Temple of Trials - I have no idea if this is like the piano or there is more to it. At the beginning back up and bail out. Keep holding left and fall down the steps. You may or may not land on a stretcher and slide down. An ambulance with a primate of some sort driving will back up over you.
Ski or Don't - At checkpoint 1 back up to hit a squirrel switch. After checkpoint 6 there will be a squirrel on a ski lift above the higher peak you'll need to bail out on.
There is also a room you can back into with a blocked door. No idea if this has any significance.
Wheels of Steel (Achievement/Trophy) - Back up to knock the board into the circuit breaker to kill the power and complete the track to unlock I Can Do This With My Eyes Closed!
Seoul Searching - Back up at the start line and you'll see a (probably) Trials of the Blood Dragon graffiti on the wall with steps leading into it. Bail out (or maybe even a good back flip) into a room through a door above those steps for a squirrel.
Beach Bum - Bail out over the fence behind you at the start line for a squirrel.
Shanghai Scrapers - At the start line back up and roll over a fan that'll push you up slightly and bail out backwards to pick up the squirrel in a dumpster.
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