The part of James Dutton in the flashback (John Dutton's grandfather) is played by Tim McGraw, who also plays him in the Yellowstone prequel, 1883.
Beth leaves out the punch line to the joke about half the money. The punch line is . . . "and they still aren't satisfied."
When Kayce met his father, he was wearing a "ghillie" suit, which is used to break up a person's outline, or camouflage one's appearance, making one harder to detect in plain sight.
Finn Little, who plays Carter, was in another Taylor Sheridan project called Those Who Wish Me Dead (2021) with Angelina Jolie.