Factual error: When Commander Eddington is being released from the brig into Captain Torrey's custody, the person manning the desk has an armband that says MP, and the captain calls him "sergeant" but the sign on the front of the desk says "US Navy" and the sign on the front of the building says "Shore Patrol." The man at the desk should have been wearing an SP armband, and Captain Torrey should have addressed him by a Naval enlisted rank. (00:36:14)
Continuity mistake: After USS Cassidy joins Torrey's group, Mac is on the bridge conversing with another officer, and the "Swayback" is visible on the port quarter. A submarine contact is made at 020/2000 yards which would be even further to starboard, and the Cassidy prosecutes the contact. Then the "Swayback" gets hit with two torpedoes on the PORT side.
Factual error: When Kirk Douglas is at the morgue to identify his wife's body, he asks the attendant about the man she was brought in with. The attendant replies, "The Army Air Force claimed the body this morning." Unlike Britain, the United States had no Air Force until 1947. A correct reply would have been "The Army..." or "The Army Air Corps..."