episodes everyone loves that you don't

"Yeah, I don't think the resemblance in that photo between the child and the man is all that great -- certainly not on the level that would lead a parent of the child, seeing the grown man standing before him, to accept the impossible to believe assertion that the man is the child, while that very child stands before them also."

First, you're ignoring the fact that it's only two photographs and not real life, and that Corey is only 3½ years old in the left-hand picture, both of which I pointed out. I don't have the slightest doubt in my mind that if Corey had moved away in 5th grade, and then I saw him again in 2014, that I would have recognized him immediately (and of course his parents definitely would too in the same situation). The same goes for anyone else I was friends with as a kid, and even people I wasn't friends with, like Marsha. I was never friends with her; she was in my class in second grade and I don't remember ever having even a single conversation with her.

Second, whether or not they "accept the impossible to believe assertion that the man is their child" is a completely different matter. The fact is, they would have recognized him as their son unless they both had, e.g., dementia, so them showing no signs of recognition at all was completely unbelievable. It doesn't mean they automatically would have accepted that he was their son and time traveled. They could have passed it off as e.g., a hallucination, work of the devil, the common folk theory that everyone has a "twin" somewhere in the world, or whatever.

"I recognized the girl from high school because she was already in her late teens when I knew her, and one's appearance doesn't change that much between age 17 and age 32. It does change a lot between pre and post-pubescence. The facial bone structure changes going through puberty. It doesn't after."

Yes, your example was completely irrelevant, since you recognized her, and she was already biologically an adult when you last saw her anyway.

"It's not silly at all that Martin's parents would act as though he were a total stranger."

Yes, it absolutely is, since that's completely at odds with reality.

"Honestly, I'm flabbergasted you're asserting this."

That's comically ironic, coming from the guy who is blatantly denying reality. How did I recognize Marsha at the grocery store? How did Thane recognize me when I was working on my car? This sort of thing happens all the time and it's not even considered unusual.

"You're telling me that ordinary, level-headed people, as they stand in the physical presence their preteen son, would immediately accept the assertion that a grown-ass man, in whom they might notice a family resemblance, is that very same son, and that he was somehow flung backwards in time from the future."

No, you're making stuff up; things I never asserted (see above). And they would notice far more than a "family resemblance," they would recognize him as their son, and then try to figure out what that means.