Factual error: In the last minutes, the show looks forward to future challenges, in effect a preview of the never-made 3rd series. The oracle says they must find "the golden fleece, woven long ago by the Stygian witches." But the golden fleece, or indeed any fleece, is not a woven fabric. (Today's fleece is a modern invention).
Continuity mistake: Throughout the episode Lieutenant Abbie Mills' lapel mic changes from scene to scene. It goes from the Motorola Commander Speaker Mic to a standard Motorola mic without the orange emergency button, volume control, 16 channel selector knob and 2 programmable buttons.
Death's Door - S1-E9
Continuity mistake: When John spits on Jedikiah, the saliva disappears from his shirt when the shot changes.
Factual error: In the scene where Bonnie gives Clyde the unloaded pistol through the jail bars, that gun was not manufactured until after 1972. It is a Bauer .25 ACP semi-automatic stainless steel pistol. Bonnie and Clyde's reign of lawlessness ranged from 1931 to 1934.
Continuity mistake: The ground is dry and clear throughout the entire episode in all exterior scenes, until the snow covered ground in the background when Duncan is driving to Ellen's house about 2/3 through the episode.
Factual error: The events of the first season take place in 1962, however, the JAG lawyer representing Sergeant Jenkins wears the Vietnam Service ribbon, authorized in 1965, and the Vietnam Campaign Ribbon, authorized in 1964.