"...but when I spilled beer in a customer's lap..."
When recently released convict Jake MacGraw * arrives in Dodge with the corpses of two cell-mates he shot in self-defense, nobody believes him -- he's clearly up to no good. People are even more suspicious when he says he's in Dodge to apply for a job as piano player at the Long Branch. Matt, of course, urges everyone to take MacGraw at face value, until proved otherwise -- but who ever listens to Matt?
MacGraw is a competent pianist (having learned while in prison -- though whether from the U S School of Music's mail-order course isn't stated) -- whose playing has a catchy beat. Miss Kitty hires him.
Things go well the first night, until he "accidentally" spills beer on Dave Wilson, and starts courting Wilson's barmaid girlfriend, Ella Horton. Wilson is a saddle bum with a not-prepossessing CV who runs around with riffraff, and McGraw hardly misses an opportunity to harass him.
What makes this an engaging episode is the way it keeps the audience guessing about MacGraw's motives. J D Cannon does an excellent job convincing us he's sincere one moment, a no-goodnik the next.
* It's hard to believe the writers were unaware of the Frank Lovejoy PI series "Meet McGraw" when they named the character. Or perhaps this was their little wink.