Several characters in this episode repeatedly refer to the decks and bulkheads of the ship as "floors" and "walls". In real life aboard a ship (in the US Navy or elsewhere) such landlubberly mistakes would become loudly hooted down. Even lawyers in the JAG Corps are supposed to know better than that.
In one scene Harm refers to the "fire-CONTROL" system inside a hood vent, whereas a correct term is "fire-SUPPRESSION" system instead. In this context a fire-CONTROL system is concerned with the direction and delivery of gunfire, missiles, or torpedoes to the intended targets.
While interviewing a suspect, Mac tells him to "excuse" his article 31 rights. It should be exercise.