The soundtrack switches to music from the 1990s whenever the players get caught up in the game, signalling that they're reverting to boyhood.
Jerry tagging Anna at the end and verbally amending the rules to allow women to play is a Fridge Heartwarming. On one level, it's an easy tag for him, since she's right next to him when he does it. However, if and when Hoagie's cancer proves terminal, it also means that she will be able to play it in his stead, and also means that his friends will still be keeping in touch with her. Jerry's reinforcing that she won't be abandoned or forgotten.
