Audio problem: When Maria is talking to the other woman at the ruins after she comes to, the last time she says, "Our friends," her lips don't match the words.
Audio problem: When the Germans are banging on the bunker door with sledgehammers the clanking sound always happens when the hammers are not hitting the door.
Audio problem: Right before the escape from the fortress, Miller throws his gun from the cliff into the water with the 'splash' sound following rather quickly afterwards. When they climb down the rope and jump in, it takes a lot longer for them to splash into the water.
Audio problem: At the end when they're on the small getaway boat, Irene Papas asks Anthony Quinn a question. He answers, "Yes," but his lips don't move.
Suggested correction: The guns are firing across a strait. A strait is a "narrow passage." Since the targets must appear at a limited range, the guns only need a limited elevation angle.
Noman ★
Watch the film again. The guns are facing the open sea. There is no land visible anywhere behind the ships. If that's a strait, it's a very, very wide one.
The mission given says the guns are guarding a strait. The last shot of the six destroyers shows land behind them on the opposite side of the strait.
Noman ★
Other summaries explain that the strait is only deep enough for the ships at the place which matches the guns' range. So ships could not take advantage of further away or closer in.
Then what are the dark shapes rising out of the sea on the far side of the ships. If they are not islands, what are they?
Noman ★
Suggested correction: That the gun carriages are supposedly set on rails is not correct. In the novel template, as well as in the film, it is shown that the guns were installed on turntables. And as for their variable angles of fire - it could be due to (fictional) modifications.
Daniel4646