Somebody posted a great vintage SF2 video on nicovideo recently. It was supposedly made way back in 1991* and features Tasaka (at the time a Chun-Li specialist) among other old schoolers demonstrating various tricks and combos. I re-upped the movies to youtube and typed up some notes (hat tip: T.Akiba) below.
* - Man, at my local arcade we were still getting the hang of DPs back then.
Baiting Throw Attempts
One key technique here involves baiting counter-throw attempts and punishing with this or that. Blanka is especially vulnerable to this trick since he has that stupid double swipe attack.
Yoga Killing Arts
There's a lot of overlap between the Dhalsim techniques in the Nagoyan video and the ones on the 48 Killing Arts of Yoga. I wonder if Tasaka's crew were rivals with Foosuke and Team Y.S.B. Watch out for Yoga Sniper, Side Magic, Yoga Bonjour, etc.
In classic Street Fighter 2 there's a small chance that you'll get a special move simply by pressing an attack button. Since the odds of this happening are 1 in 512, these are called, "512 Special Moves."
I couldn't spot any 512 Moves in the video myself, but if you see a mysterious Sonic Boom or Sumo Missile this could explain it.
In the same fashion as the above glitch, there's a small chance that you'll automatically block even if you weren't holding back on the joystick. This can happen even if you were recovering from a move, too.
This one was unfamiliar to me so I can only offer conjecture:
When a character gets to their feet after being knocked down, there's a brief window where they are immune to throws. If you attempt to throw them at a precise moment, however, the game will sometimes (randomly?) ignore this immunity. See pt.12 @ 8:48 for a clear example.
Blanka takes double damage when he's hit out of the ball. Also, Ryu sometimes takes double damage when he's dizzy.
Zangief's Rapid Crouching Short
After doing a crouching short with Zangief, if you quickly press jab he'll do another crouching weak kick instead of a punch. Keep hitting jab and Zangief will kick rapidly.
Blanka's Semi-Unblockable Bush Buster
Instant (aka zero frame) attacks have a 50% chance of being unblockable if they're done close enough. It's like the attack is so quick that your opponent doesn't have time to put their arms up to block. Take a look at pt.10 @ 0:44 to see an example of this.
This phenomenon persisted all the way through SSF2T. Here's a list of zero frame moves:
WW Blanka - vertical jump fierce
Any Blanka - horizontal and vertical balls
HF, SSF2, O.ST Ryu and Ken - air hurricane kick
Akuma - air hurricane kick
HF Zangief - quick lariat
If you press short + fierce simultaneously you'll do a fierce attack. You can chain from a regular short kick into this as if it were another short. To combo crouching short -> backfist with guile it goes like this:
down + short -> neutral + short + fierce
This is called a CPS1 chain because it works through SF2HF (the last SF2 game to use the CPS1 hardware.)