As Matt and Festus walk left past the alley beside the jail, the side door is seen, and a solid wall. The bars and window of the cell are missing.
When referring to the Arkansas river, Ethan mispronounces it, using the pronunciation of the state with that name: ARE-can-saw. The correct pronunciation of the river is the word "Are" plus the name of the state north of Oklahoma: Are-KANsas.
Festus is leaning on the bar, talking to Sam. When he straightens up to leave, the whole bar wobbles. As seen in previous episodes, the bar is much sturdier than that. It has to be for all the fights that go on, and the people that get thrown into and over it.
When Ordman is in front of Matt's office, the camera moves in, and its shadow is seen on a post and the people walking by.
At the 50:59 mark, when Festus is standing behind Doc and talking to him, you can clearly see the shadow of the boom microphone to the left of Festus' shoulder.
Malachi and Ordman are in a standoff in the Long Branch, with Ordman getting ready to kill Malachi. Sam, the bartender, just stands beside Malachi, instead of moving out of the line of fire.