The clip from the Mazda commercial is from a DVD called "The London Rock and Roll Show," (circa 1971); Wembly arena, professionally filmed (check Wiki).
There's also the "John Lennon & the Plastic Ono Band" Live from Toronto, 1969.
Both are offered for sale via a few online retailers/aggregators, the most reputable being MVD video and Amazon.***:
The clip from the Mazda commercial is from a DVD called "The London Rock and Roll Show," (circa 1971); Wembly arena, professionally filmed (check Wiki).