Continuity mistake: James is described on the cast list as a Staff Sergeant, but he wears the rank insignia of a Sergeant First Class.
Continuity mistake: When Pavel picks up the tire from the outhouse, it is a thin tyre with vertical lines, when Bruno is swinging on the tyre a few shots later, it is a thick tyre with lines both vertical and horizontal.
Continuity mistake: When Leonidas says, "The oracle also said our painted-on abs look fake," the fat guy is having abs painted on him, but when the Spartans are skipping, his abs are gone.
Continuity mistake: Shortly before the big cattle drive arc begins, Kipling Flynn pours a teacup full of rum for Lady Ashley to drink. The camera cuts to an over-the-shoulder view as Lady Ashley starts to tip back her teacup; at this point, you can see that the cup is completely empty.
Continuity mistake: Near the end, the tank's turret is seen turning. Camera does a quick cut and it's back to where it was before. Camera cuts and it's turning again.
Continuity mistake: When the soldiers rip off posters that depicts racial images of buffalo soldiers, the board underneath remains blank. Later in the movie, when they are about to escape the town, the board is shown with tattered old postings again.
Continuity mistake: In the beginning, when Michael Berg is sick on the street in Neustadt and is leaning on a wall to throw up, he's near a closed door and is positioned to the right of that door. Next shot, from inside, shows the door now open and he is leaning to the left part of the door. (00:03:15)