Continuity mistake: Angelica has flowers on her dress. During the wedding, they disappear and reappear between shots.
Audio problem: When we are first introduced to Hayden lecturing the classroom, the shots from behind do not match the sound with the movement of his jaw.
Audio problem: During the talk of the three Glorias, the teen Gloria's mouth isn't in sync with what she's saying.
Other mistake: At the end of the movie, when the escort vessels are relieved by the British forces, Greyhound orders all escorts to form up in starboard echelon. In the long shot, as the Greyhound and the surviving escorts sail away, they are formed up in port echelon.
Factual error: The BBC announcer says it has been almost thirty years since the coronation. Since the film is set in 1970 and the coronation was in 1953, this is completely incorrect. Not a mistake the BBC is likely to have made.