Continuity mistake: The guy who is wearing the night vision goggles has the chin strap undone. But when he and the other guy are playing around for a moment outside the shack they find the booze in, one shot shows the chin strap suddenly secure and fashioned around his chin. Then it is undone again.
Death's Door - S1-E9
Continuity mistake: When John spits on Jedikiah, the saliva disappears from his shirt when the shot changes.
Continuity mistake: At dinner the two male guests in the forefront both have a full plate of food and a man in a brown shirt is pouring gravy on his meal. In the next shot the two men are shown serving themselves for the first time. (00:57:00 - 00:58:00)
Surf'N Turf/Hardcase Returns - S1-E8
Revealing mistake: In "Hardcase Returns" Skidmark uses a digital phone to track a GPS device installed on Turbo's parade car. When the keypad on it is shown, 3 letters are missing. They could have been on the keys that had nothing written on them, but we will never know for sure because nothing is on them.
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).
Charleston - S1-E6
Continuity mistake: There is a plate switch when putting pulled pork on the plate, the pork drastically changes from a shredded mess to a nice portion of gorgeously smoked pork with pickles on top. (00:28:00)
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.
The Marathon - S4-E3
Plot hole: Jason cheated in three different ways in order to beat Aurelius in The Marathon, and admitted it. So the bet that they made between them is null and void. But the last shot shows them living up to the terms, which includes Aurelius starting to eat his own shit (literally), so revolted that he's trembling. Apparently the writers really really wanted to include coprophagy. But who would eat faeces for a bet, if you can simply avoid it by reminding your opponent that he cheated? Or even better, many would say that cheating means losing automatically, so he's the one who should be eating his own shit.