Other mistake: In the final scene when they are about to charge Fort Wagner, Mathew Broderick yells "forward march!" and takes his first step with his right foot when it should have been his left foot like the rest of the battalion.
Other mistake: During the big protest march scene which is supposed to have taken place in the early '70's, one Vietnam vet who is sitting in a wheelchair is clearly wearing a pair of high top Reebok sneakers introduced in the late '80's.
Other mistake: A shot of Karen on the exercise bike is used twice: the first time is out of order with the following shots because her hair is long, then short, then long again. The same shot is used to depict a few years later.