- Movie Goof (continuity error): When the liquid is poured on Jonah's chest the poultice is not there but is there again in the next shot.
- Movie Goof (continuity error): After Jonah uses the guns mounted on his saddle they suddenly have the blankets wrapped around them again.
- Movie Goof (factual errors): When Turnbull is explaining the origin of the "super weapon" to Burke, he attributes it to Eli Whitney, Senior. In fact, it was Eli Whitney, Junior he is describing.
- Movie Goof (revealing mistake): In the still photograph of Lilah (Megan Fox) where a slip of paper is tucked under her corset, you can see her tattoo through the fabric which reads "Brian".
- Movie Goof (anachronisms): The Washington Monument is shown as almost complete. In 1876 the Monument was still only one third complete and construction had been stopped since 1858. Addition construction was authorized during the Centenial but actual construction did not resume until 1879.