Did George Mcfly Know Who Calvin Klein Really Was?

This video has been revised due to audio problems:
https://youtu.be/DfVRuCZOk8E

Fan Theory. Many people ask the following question: As Marty grew up, why didn't George Mcfly recognize how much he looked and sounded and acted like that Calvin (Marty) Klein kid he met in High School? There's every indication that he could have (even if they didn't remember what Calvin looked like).

Disclaimer: A lot of people are leaving comments here that insist Bob Gale "debunked this theory" recently. Those who post this misunderstand the intent of this video. Recently, Bob Gale answered those who insist that he made a mistake in the script because George and Lorraine should have recognized Marty as Calvin when he got old enough. Bob points out (rightly so) that they wouldn't remember him based on his looks, they only knew him a week, decades before. Obviously many who watch this video think I'm listing all the reasons they SHOULD have recognized Marty when he got older. This video is not intended to do that. This video merely poses a theory about how they COULD have known (not should have known). I'm not trying to say in this video that Lorraine and George should have known, just having a fun time with an alternate ending where they figured it out and did know by the end of the movie.

Many ask the source of the cover tune "Back In Time" used at the beginning.

That is by Jesse Stutsman
https://www.youtube.com/watch?v=4BIsf1Vur7Y&list=PLST2Y3MIb4DVnm7XTx7_bTvcyvogECIwm&index=2&t=0s

Видео Did George Mcfly Know Who Calvin Klein Really Was? канала Jeffrey Dean