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

K-19: The Widowmaker (2002)
1 visible crew/equipment mistake - chronological order
Directed by: Kathryn Bigelow
Starring: Liam Neeson, Harrison Ford, Christian Camargo, Peter Stebbings, Roman Podhora, Sam Spruell
Factual error: Many shots of the submarine in drydock show Halifax, Nova Scotia's MacKay and MacDonald bridges in the background.
Captain Alexei Vostrikov: We will not fail.
Trivia: The 'American' destroyer seen from far away in several shots is actually the decommissioned destroyer HMCS Terra Nova.
Question: When they fire the test missile it appears to come out of the sail. That would be incorrect, no? (00:49:30)
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Answer: The movie is correct on this. The early Soviet ballistic missile subs like this one had the missile launcher in the sail, carrying 3 missiles. Missile tubes integrated into the hull, and the ability to fire while completely submerged, didn't come til later.