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When Alex gives her speech in the Season 1 finale about not making the same mistake she made.
When Alex and Dave hold hands in the Season 2 finale.
Even though Dave is unable to win the game for in "Kickball 2: The Kickening", as the opposing team had caught his ball, most of the gang cheerfully congratulate him on stepping up to plate, getting over his phobia of kicking the ball after hitting Penny in a previous game. The only person who doesn't congratulate him is Penny... who is writhing on the ground after getting hit with Dave's kick... again.