The "twist" in this one doesn't make any sense - to me, at least. If this guy's recent trip into the past was just a fantasy, but he has the kid's baseball cards in his pocket when he returns to reality...well, so what? We know he can't be still living in his fantasy flashback because he's returned to his normal life with his wife and new baby, neither of which existed during his encounter with the kid. We also get the point (a cliche by today's standards, but maybe somewhat novel in 1960) that the trip to the "past" has shown him that the "present" isn't so bad after all. But the relevance of the baseball cards surviving a trip back to the real world was completely lost on me.