Continuity: During the briefing Harrison Ford was receiving from the Generals, he has 3 stars on his shoulders, but for the most of the rest of the movie he only has 2 stars on his shoulders.

Factual error: Many shots of the submarine in drydock show Halifax, Nova Scotia's MacKay and MacDonald bridges in the background.

Continuity: When we first see Harrison Ford's (Russian) character, he is wearing a gold wedding band on his left hand. Russians wear their wedding bands on their right hand. The next couple of scenes in which we see Ford's hands, the ring is correctly on his right hand. Then it disappears completely for most of the film. When he is suiting up in his dress uniform near the end of the film, it is back on his right hand, and remains there for the rest of the film.

Continuity: The conning tower of K-19 is pressure damaged in the scene where they take the sub to 300m, yet in subsequent scenes the tower is intact and in perfect condition.

Other: In one of the scenes where a repair-crew works inside the broken reactor, one of the men can be seen not wearing one of his handshoes. In the moment before and after that, he does wear it.

Continuity: In the scene where the sub launches its test missile you can see the ice around the sub cracking up. Yet later when the crew is outside playing football on the ice, there are no cracks visible.

Factual error: In the scene where they are cutting the stainless steel reactor pipe to tie in the new water supply, they are using a cutting torch, only carbon steel, ie. steel that corrodes, can be cut by torch.

Factual error: As I've seen posted, the conning tower (a more correct term is "sail") of the sub is damaged by the sea presure, and later appears intact. In fact, this kind of damage at the place that is shown in the movie should not happens because the sail is a "free flooding" structure: the pressure is the same inside and outside the plates, and only the watertight structures housed in the sail (missile tubes, periscopes and masts, access trunk, etc.) have to withstand the sea pressure.

Continuity: In the opening sequence, during the missile drill in dry dock (the one that fails) we see one of the engineers open the missile tube to examine the missile. By this point, the exterior hatch has been opened, and daylight is quite visible within the tube, yet moments later Liam Neeson's character climbs out onto the conning tower revealing that its night time outside the submarine.

Continuity: The name of the reactor officer, as mentioned several times in the film, is Vadim Radchenko. Toward the end of the movie, in the cemetery, his gravestone says 'Victor Radchenko'.

Visible crew/equipment: In the scene at the end in the cemetery, you can clearly see the reflections of the boom mike and camera in the shiny brim of one of the guy's hats.

Other: In all scenes where the submarine is running on the surface the surface search radar is rotating CCW (viewed from above). All surface search radars rotate CW.

Factual error: When the rescue sub pulls up to the K-19 to begin offloading the crew, the rescue sub is a NATO Oberon class sub, even though it was meant to be a soviet submarine.

Continuity: When the crew is waiting for the confirmation from Moscow to launch the missile, there are 3 lights flashing one after another. Then, when they receive the confirmation, there are two lights on, but in the shot later there is only one on.

Continuity: During the rescue scene with K-19, submarine S-270 has 270 painted on one side of the fin and on the other side has 378 painted on it.

Factual error: The film takes place in 1960, but the propaganda film shown by the Political Officer includes TV footage from the Civil Rights demonstrations in Birmingham, Alabama in May 1963.

Factual error: In the scene where the General's black Russian car ("Volga" car) stopped near "Soviet NAVI headquaters" and General is entering the house, those who can read Russian can see that this is "Frunze's Museum of Russian Army" - it's just an ordinary Russian museum in Moscow and has nothing in common with the government.