Continuity mistake: During the first battle in the woods, the Union Regiment levels their un-bayonetted weapons and fires a volley at the Confederates. About 3 seconds later, without the order having been given, they are in hand to hand combat with bayonets fixed.
Continuity mistake: When Tom Cruise is lying in his hospital bed and begins freaking out, he knocks over a pitcher from the small table next to him. In the next shot the pitcher is back on top of the table. (00:57:00)
Continuity mistake: When Jerry goes to the plane from England to USA, the plane is white and has a TWA logo. When he arrives, the plane is silver, and the logo is one of the American Airlines.