Character mistake: When Frank is starting to show Amy how to take the gun from him he removes the magazine and makes the statement "clip empty" - any Marine, certainly one as well trained as him would never refer to that as a "clip" - it is a magazine. A "clip" is a device intended to help rapidly load ammunition into a magazine.
Character mistake: During the CO's meeting, the Captain made a mistake by addressing Commander Blackburn as "Lieutenant Blackburn." Even if he was demoted to Lieutenant Cmdr, you still suppose to address that rank as Commander or Lieutenant Commander. (00:04:44)