Gadgets: canteen filled with flammable liquid
Disguises: Southern sketch artist Mr. Lindsay, Fargo the blacksmith
While the phony Jim is lying on the bank floor, his zipper is half way down. In the next shot, it is closed.
During the scene when Jim is sent out to face the top three students, he comments "They're armed, I suppose." The voice that speaks is definitely not Robert Conrad's.
When the first student, Giddings, shoots at Jim, he fires three shots. However, when Jim knocks him out, Loveless tells him that he only had one bullet in his gun.
Dr. Loveless boasts to Jim that he is planning operations against a prison, an armory, and a treasury. When relating this to Artemus, Jim adds the information, apparently plucked from thin air, that the operations are to be performed simultaneously.
The "wolves" that Jim wrestle with, particularly in the opening scene, are blatant dummies with wolf growls dubbed in on the soundtrack.
In the first shot of Talamantes' underground tunnels, a spider crawls right to left. It's clearly fake, and the legs barely move as someone pulls it across on a wire.
When Jim escorts Talamantes out and they encounter the wolves, Jim calls the bad guy "Professor." There's no indication previously that Talamantes is a professor, or that Stefan told Jim that.
When Jim throws the boot grenade at the wolf, it doesn't just run away or die. It literally vanishes thanks to some camera trickery.
When Jim escapes in the mine cart, first it is clearly moving quite fast but in the next long shot, it has come to a dead stop. Secondly, the mine tunnel behind Jim explodes for absolutely no reason and from no visible cause.
Disguises: King Stefan IX
Gadgets: smoke bomb in boot heel compartment
Disguises: prison guard, traveling emporium salesman Kelton
Gadgets: a clockwork skeleton key attachment, self-inflating balloons filled with knockout gas
Jim shoots Artie in the chest and stomach twice, but there are no bullet holes in his tunic.
Gadgets: thermite paste
Disguises: English hunter Sir Ian-Jellicoe Cooper-Fenstone, President Grant
In the episode, Grant is traveling by train to San Fransisco. In reality, Grant never traveled further west than Colorado during his time in office.