The Night of the Bars of Hell - S1-E22
Continuity mistake: In the closing scene of this episode, there is a daytime close-up of their boxcar. When Ms. McCoy walks into the boxcar, it is pitch black outside. Ms McCoy leaves after a very short visit. The last shot of the boxcar leaving shows it is nighttime.
The Night of the Bars of Hell - S1-E22
Continuity mistake: Artie inspects the electrical panel on the wall and the throw switch is at a horizontal position. A quick cut later and it is at a slightly lower angle.