I cant even believe how much the 'mass produced' bike does the wave after that drop. Wheels wobbling out of round, fork flexing, frame, bars flexing mess. I never have seen such a good demo of the difference between good components and crap!
Size is not an advantage in trials at all. A taller guy has a slightly easier time bunny-hopping straight up things, but in that video, Mike sidehops up the same block from a dead stop. That's SICK!! There's no momentum to help get him up in the air at all. Also, a true trials rig like Mike's has a huge leverage advantage over a bike like Jeff's "urban" setup.