Thanks, I couldn't find better resolution to read dates.
1963, so he's 20 on the first pic. In the army, so logical that his hair are short.
4 years later, 24, discharged, longer hair, following hairstyle trends from so-called artistic circles.
I have trouble seeing that. I mean...
If I saw a guy who looks like this today:
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Then it's quite likely that I could make a mental note about him: "oh, this guy looked kinda like Jim Morrison" or "that guy had Jim Morrison hairstyle".
But I have serious trouble recalling seeing any man with similar hairstyle in quite some time. It's not in fashion now, and it was in fashion in late 68 and for some time later.
And this is 1968 Jim Morrison. This is what people saw in papers and occasionally maybe also on tv.
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I just can't imagine young girl in the late 60's, somewhat connected to the hippie scene to go through her daily life, then see this creepy muppet...
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... just to remember him as closely resembling Jim Morrison.
Unless everyone who agreed on it, or recalled him to look like Jim had next to zero exposure to handsome young men with longer hair.
In that case absolutely.
For someone exposed only to young men wearing themselves like those two fine gentelmans visible on the picture below and representing Montreal street fasion from 1968 (it's a screenshot from this video
) I can totally see it as valid possibility.
Muppet shows up, he has longer hair, looks kinda handsome, this Jim Morrison guy also has longer hair, also handsome, also dresses himself more hippielike, not as clean cut as other guys around => easy to see a connection, easy to make this mental note, easy to remember him like this.
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I'm under impression that it wasn't the case with those who had a chance to meet that "John" and share their experience after Reet was identified.
If it was... then it really tells us nothing more than "a guy, in early to late 20's, with longer hair".
But if it wasn't... well, every random group picture from party or music festival and there is at least one (sometimes even a few) guys looking kinda like Jim Morrison. For a young woman from late 60's, one who saw many hippies, to say that she remembered a guy as looking like Jim Morrison, I'd bet on some significant resemblance.