The Night of the Colonel's Ghost - S2-E24
Continuity mistake: The opening scene of this episode shows the train moving at twilight. West and Gordon are looking out the window, and it is pitch black. Right before West goes outside, the camera shot of the train wheel shows light (either twilight or moonlight) on the wheel. The very next scene has West with the train door open, and it is pitch black outside. (00:00:05 - 00:00:35)
The Night of the Deadly Blossom - S2-E25
Continuity mistake: When Barclay hangs the bone hatchet back in its place, the outline on the wall supposedly left by the item differs significantly from the artifact itself. (Most noticeable is the upper end: the outline has one long curled tip, but the actual hatchet has two short prongs there.) The outline was apparently drawn without the prop, or from a different prop altogether. (00:12:05)
The Night of the Skulls - S2-E13
Continuity mistake: West crashes through the French doors, breaking out the center section and leaving a partial framework on either side. In the next several shots, the center support and one broken frame reappear and disappear repeatedly. (00:02:30)
The Night of the Man-Eating House - S2-E12
Continuity mistake: Near the end, when they confront Liston Day outside the house, West and Gordon are standing close together in all the frontal shots, but several feet apart in all the reverse angle views. (00:45:30)
The Night of the Poisonous Posey - S2-E7
Continuity mistake: The bad guys throw an unconscious West down a chute into the ice house. He goes in with his arms at his sides, then slides with his arms above his head, and finally lands with both hands folded over his stomach - all while remaining unconscious. (00:30:30)
The Night of the Flying Pie Plate - S2-E6
Continuity mistake: At the end, the wagon tailgate falls open during the scuffle with the bad guys. When West fights his way to the front and drives the wagon away, the tailgate has somehow tied itself up again. (00:48:00)
The Night of the Raven - S2-E3
Continuity mistake: West stabs the giant cat in the left front paw. But when the cat is shown licking its wound, the injury is on its right front foot instead. (00:46:15)