Character mistake: When the adults are inventorying the weapons in the armory, one of them walks over to a case of pistols and says, "Pistol, 45 millimeter, M 1911A." The M1911A is a .45 caliber pistol and is listed as such right on the crate. There's no way the actor could have read "45 millimeter" anywhere on the crate.
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Mistakes
When Gen. Besh is seen preparing for the Ball, he is shown holstering his pistol. (A Presentation model .45) The hammer of the pistol is visible and uncocked. Later in the fight scene when the kid jumps on the Generals back and pulls the pistol he is able to fire it w/out cocking the pistol. Pistols of this type are single action on the first shot, in order to fire you must 1. Chamber a round or 2. Pull the hammer back with your thumb. The boys' hands are visible from the time he draws till he fires and he does neither. See more...
Taps mistakes
Continuity: When Cadet Major Morelan is unbuttoning his jacket he unbuttons the top 2 buttons and the bottom 2 buttons. This leaves the middle 3 buttons fastened. He then sits down and is talking to Tom Cruise, Sean Penn and 1 other Cadet. In the next shot when he stands up, the bottom 3 buttons are now unbuttoned and only 2 buttons are fastened. He had sat down with his hands on his knees and that never changed. The button could not/would not unbuttoned itself.
Continuity: When Gen. Besh is seen preparing for the Ball, he is shown holstering his pistol. (A Presentation model .45) The hammer of the pistol is visible and uncocked. Later in the fight scene when the kid jumps on the Generals back and pulls the pistol he is able to fire it w/out cocking the pistol. Pistols of this type are single action on the first shot, in order to fire you must 1. Chamber a round or 2. Pull the hammer back with your thumb. The boys' hands are visible from the time he draws till he fires and he does neither.