1. Snowboards were rockered before they were cambered, Mervin and K2 both re-introduced functional rockers the same season. The success of the Skate Banana made every other company re-think their board designs.
2. Canting was a very popular upgrade for softboots and hardboots in the late eighties into the early ninetees. Most canting back then involved angling the entire baseplate with a riser plate. There was at least one compay who was selling foam pads that you glued in place like a footbed. The first modern canting system I can remember seeing is the EST canted footbed by Burton (other than Catek.)
3. No U.S. boots and maybe Catek for binders (overkill for almost every rider out there.)
4. Most pro without (some with) binding sponsors ride Burtons.
5. Edge tech started with skis in the seventees but never caught on in that market. Burton might be the first on this one as well, PDE on the T6 was before magne. Magne-traction was the real start of the craze though.