The grandparents and grandchild with a dog in the scene where Simms yells at them after asking for an autograph are played by Kevin Costner's parents, Sharon Costner and Bill Costner. The grandchild is played by his son, Joe Costner.
Kevin Costner is shown at times drinking Shiner Bock Beer. This beer is brewed in Shiner, Texas, and not well-known nationwide. Where has this beer been in movies before? In Fandango (1985), in the hands of Kevin Costner.
On the 2nd hole of Day 4 of The Open, Roy bets Gary McCord $50 that he can get his third shot on the green (off the porta john). Roy's shot comes up just short of the green, but we see McCord paying Romeo the $50.
During the opening credits and the opening scene, the range is shown at twilight, and Roy hits balls into the setting sun, yet when he and his entourage enter the pro shop, the light coming through the blinds, as well as the view of the range through the front door clearly show it to be daytime. When Roy and Molly step outside to begin her first lesson, it is twilight again.
Dr. Molly Griswold: I'm a, like, terrible shrink, probably. I should have never gotten out of real estate, shit, actually, I should have never left Ohio for that cowboy in Amarillo, but... Have you ever been to Amarillo?