Mr. Larson reconciling with Happy. "I know we've had our differences in the past but I'm truly proud of you." They shake hands and at the end of the movie he beats up Shooter for stealing 'Mr.Gilmore's jacket'.
In the final tournament, Grandma tells Happy not to worry about her and just play the game. "I just want you to be happy, darling."
Happy's relationship with Grandma is really sweet in general. One of the images in his Happy Place is her getting enough money to buy her house back and then some.
Special mention goes to her introduction, where Happy's talking about his past.
Happy: After [Dad's] funeral, I was sent to live with my Grandmother in Waterbury. I was kinda nervous since I didn't really know her that well, but she dressed like Gene Simmons from KISS to cheer me up. She's the sweetest person in the world.