I hated the revisionist history on that show. Corey and Topanga didn't even like each other during the early episodes. Later they tell us how they've been inseparable since the first grade.
They were always together. Topanga, followed Corey for years. I never thought they implied they were a couple since early grade school.
I never thought this show fell down, it just suffered from shifting from the show it was to being a Eric Matthews vehicle. It was all about Eric the final 3 seasons, I agree that I never got the character change there with him. In High school, he's popular and the girls love him but in college he is a loser who can't get any girls and has a sick obsession with Feeny.
They had a flashback of Corey, Topanga, and Shawn at the Zoo when they where little kids.I think it was supposed to be first time Corey and Shawn met. Topanga was a normal 6 year old girl. They denied her Hippie heritage.