When William Holden is visiting Frederick March in the Admiral's cabin a boom microphone is visible near the air conditioning ducting in the ceiling. A shadow is seen, then the microphone drops down into the shot. The microphone moves a bit and then is raised.
Although the carrier used in the movie was the U.S.S. Oriskany, for the film it was given the fictitious name of U.S.S. Savo. I do not know why that name was chosen or by whom, but it was a very ironic choice. Although many U.S. carriers have been named after famous battles that were American victories (including Oriskany), the Battle of Savo, early in WWII, was one of the worst defeats in the history of the U.S. Navy.