THIS video is only about 40 years old, so I should get an answer brightly quick. 
At 3:13 until 3:15 (barely subliminal) there are 2 hippy dippies shown. The woman doesn’t look comfortable being there. The guy looks like he has a camera remote button but I could be mistaken.
IMHO this is not Paul & Linda, but I’ll be corrected if wrong.
Any idea who these two are? More importantly, WTF is going on in those 2 seconds?
Doesn’t look like anyone else in Wings that I can identify. Any clue?
The guy on the left looks like Jimmy Savile. Don’t know who the other person is, but given what’s come out about Savile since his death, there’s a good chance they had reason to feel uncomfortable… It’s probably from one of his TV shows. Why it’s in among all that footage of the McCartneys, I don’t know.
It is Jimmy Savile. It looks like a clip from Top Of The Pops. The girl is likely a member of the audience that he’s got in front of the camera to introduce the next act (probably Wings with Mull of Kintyre, if the clips before and after are any indication). That was something he (and the other presenters) used to do. The thing in his hand is a microphone.
Brilliantly swift you two are. Though I’ve heard the story I had no idea what Jimmy Savile looked like. I never would have figured this out.
I still think it’s an odd blip in the video. And that woman doesn’t look at all comfortable with his arm crooked around her neck like that.
This actually appears to be a fan-made video, produced by one mralan1969uk, which accounts for why there’s 1977 footage (from the official 1977 “Mull of Kintyre” video, as noted by WotNot) in a clip for a 1975 song, as well as the seemingly random insertion of Jimmy Savile.
“Treat her gently, treat her kind. She doesn’t even know her own mind…”
Nice clips of Paul and Linda and a few shots of their kids. 'Til death they did part…