Other mistake: Jim Beavers, who plays Drew Thompson/Sheriff Shelby as a character, does not wear glasses in the show. The actor, however, does wear them off camera, and just above his ear, you can plainly see an indent of where his glasses sit in multiple different scenes.
The Hammer - S1-E10
Character mistake: Raylan Givens tells Judge Reardon that he carries a ".45 Glock" but this is untrue. Throughout the series with the exception of the beginning of the first episode Raylan Givens carries a Glock 17, which is only chambered in 9mm parabellum. His backup can be seen to be a Glock 26 which is also in 9mm.
Ava Crowder: I'm going to have to get a new bed. Unless I want to keep this one as a conversation piece.
Question: Mags poisons herself with the same "it was in the glass, not the jar" approach she took with Loretta's father. But we see her grab two glasses - one from the cupboard and one off a shelf. Does she slip poison in while off camera, or is it just that the cupboard/shelf glasses are always poisoned, trusting that everyone knows not to use them? Seems like a crazy risk to take.