Character mistake: As the helicopter crewman sees the Dallas surfacing, he says something along the lines of, "Sub at three o'clock". The next shot is from inside the helicopter and shows the sub and a part of the starboard landing gear retracting pod. This shot puts the Dallas closer to one o'clock. (01:24:00)
Character mistake: Characters refer to the Dallas and the Red October as "ships," but anyone stationed aboard a submarine would know to call it a "boat."
Answer: The caterpillar drive was inoperable. The reactor leak was staged by the defecting officers, but the sabotage to the caterpillar (by the undercover KGB agent posing as the cook) was real.