Goofs

In the montage shown at the beginning of the Civil War, the U.S. flag is correctly shown with thirty-four stars, but the arrangement is incorrect. It should display two rows of seven, one row of six (centered) then another two rows of seven.

Owen takes a young boy under his wing and is aided by Boston, a saloon girl. She sets the boy a sum to complete and when it's done says it's correct but it's not as the 3rd line should be 16535 not 23536 which obviously makes the final total wrong. the sum is 7842 + 8693. Update: the boy is multiplying the two amounts not adding them and his multiplication is correct.

In this pre-Civil War tale, two Secret Service agents discuss the probability of war breaking out. The Secret Service was created after the Civil War.

Dynamite was not invented until after the Civil War.