xTopGun
Buckeye
I've only ever noticed it being untied in that one opening scene, never in a shooting during the show .....James Arness was wounded in the right leg, and lost part of his foot in WWII. He had issues with that leg for the rest of his life, and always filmed any scenes that involved a good deal of walking or running first thing in the morning. You can see that he had a noticeable limp in many episodes of Gunsmoke...That's also why he never tied down that holster.