When Mike comes up from the mini-sub and climbs on the ship, it's obvious someone forgot to put a filter on the camera. The sky is much too bright for moonlight. A few minutes later when Mike leaves the ship, the sky is totally dark. Since this is early in the timeline of broadcast television and more footage was shot during the time in question than the time that the sky was dark, it is probable that they shot the footage without the filter because it would have been hard for the early equipment to capture.
The ship's name 'Svoboda' is visible in the Latin alphabet on two life preservers and a chalkboard within the Svoboda. Since the Svoboda is a Soviet ship, the ship name should be in Cyrillic.