I’m very surprised given the interest in Paul’s demise that there are so few clips out there from the September 1966 Melody Maker awards that Paul attended.
This is August 28th 1966 in LA, although some descriptions list it as the 24th. Paul looks like he has looked for awhile. The question regarding the use of Beatle doubles is at 5:36.
Now here getting off the plane on August 29th 1966 in San Francisco, Paul looks different and his hair looks longer.
I’m not converting my opinion on the subject any, but looking at these clips I certainly understand why there is a question about a double.