Another "tribute to McQueen" scene.
Magnificent 7: Trapped in the room with the dying Harry, Vin takes the extra six-shooter he had and, running it dry, he just tosses it aside.
Silverado: As the three attack the ranch, Emmett dismounts, run up to the door and tosses away the empty spare six-shooter.

Thete are many references/tributes to classic Westerns; the church from High Noon, the barroom from Dodge City (I kept waiting for the big brawl), etc., that I thinks it's justified to believe the McQueen tie-in. Anyone notice any others?

That is the "Pony Express mount".
Hang a bit, straighten both legs, take a little hop and when you punch your feet to the ground you spring up and over the saddle. Sometimes guys do it with a sort of one,two and come up spread-legged.
Either way is pretty cool.