Sara and Amy hugging it out, after Sara admits she was jealous of Amy despite Amy also being jealous of her.
A deliciously satisfying moment that also doubles as heartwarming is Amy's parents apologizing to her for disbelieving her and declaring that now they'd seen she was telling the truth all along.
There's also the Gainax Ending reveal that Dennis, the dummy Slappy replaced, had somehow managed to come to life on his own and destroy Slappy in a Curb-Stomp Battle, he even tells her to stand back before taking care of Slappy. Even though Amy replaced Dennis, he was still loyal to her and saved her life. In the episode version, it's still played for horror for some reason, but there's still something sweet about him happily declaring that "it's good to be back in the family again". He considers Amy's family to be his family too!
