About 30 minutes in, the narrator says that no one knew where K-129 sank. But the British & the US knew its exact location, within 50 square miles - a VERY small area within the Pacific Ocean. And they knew that location within hours of it sinking. It was later photographed by the USS Halibut in 1968, as described later in this film.
About 19 minutes in, Josh Dean describes The Hunt for Red October as "a submarine being taken over by a rogue crew", but the crew was unaware of the takeover by the rogue officers.