A few years back Apple Corps discovered that film footage of The Beatles that was used for a promo film for "Lady Madonna", was in fact footage of the Beatles recording "Hey Bulldog".
It was shown on ABC's 20/20, but with Elizabeth Vargas talking over the entire piece!!! But thanks to the magic of non-linear editing I was able to place a recording of "Hey Bulldog" over the 20/20 piece.
I can't vouch for any of this, but I don't think I've ever seen this footage in either case. What's inarguable is that this is one of their absolutely top-shelf rockers, and don't they just look incredibly cool?
[h/t Frankie O'Malley of the fabulous Safes]