I wish MST3K had tackled more westerns because they were ripe for parody, because they are usually so 'straight'.
When the hero arrests three men:
"This is really embarrassing for the horses, because they know each other."
"Broad backs of the West!"
"Small talk of the West!"
Horse - "You should have tied me up properly. I'm just gonna to pull lose from this knot y'know? There I go, told ya."
Here's my favorites:
"The Hittleman Empire started with this movie".
"God love the drunken old fart" speaking of Remedy.
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That's All Folks
Those are good ones. Here are some others:
"A small part of Jacksonville died that day."
"Getting shot was the best thing that ever happened to him."
"There's a Hooverville in this town."
"He's wearing a different shirt. It must be a disguise!"