These videos are from the 1996 E3.  “After the E3 Press conference the Press was given this B-ROLL for newstations and media alike.”  There are minor differences between the beta version and the final retail version, such as different title screens but the coolest part was that Kamek was a playable character in the Mario Kart 64 beta.

Video 1: Killer Instinct, Wave Race, Mario Kart, Blast Corps, Kirby’s Air Ride, Star Fox


Video 2:  Mario 64, Star Wars, Pilot Wings