Factual error: When Ryan is brought on board the Dallas, Captain Mancuso climbs down from the conning tower, through the hatch next to the control room of the sub. He then walks/runs down two flights of stairs and enters a short corridor where Ryan is now dropped on the floor by the safety diver and another crewman. I am unsure of the exact location of the lower hatch of the escape trunk on a 688 sub, but I suspect it would be on mid deck. When the camera turns to face Mancuso again you see the curvature of the hull next to him, suggesting this takes place on an upper floor on the sub. So why did he run down two stairs to seconds later end up on the top floor of a sub with only three floors inside the pressure hull?
Factual error: In some stateroom scenes in the October the bulkheads have numerous little lockers installed because storage space on a submarine is at a premium. The latches on the lockers are of a unique design created only by USA Navy ship and submarine construction shipyards.