I don't know what it is, but I feel like the show really really clicked for me in Season 4. I really enjoyed Season 3 and I liked different episodes and arcs in Seasons 1 and 2, but Season 4 just wowed me. I just felt that everything was building to the ultimate and I really fell in love with the show then.

When I got back and rewatch, maybe I'll feel differently about the first 2 seasons.

And thanks for the bit about the flowers! I know there was a previous ep that had them and then they talked about them here, but I wondered if it would turn into something even more.