When the heat monster sets the admiral's shirt on fire, the flames are on his left shoulder. Later, the shirt is shown with damage on the left sleeve below the elbow.
Seamen Kowalski and Patterson are menaced by the heat monster in the engine room before they escape. When Nelson and Crane encounter them after their escape, Patterson has been replaced with another unknown extra. Later, Nelson and Crane refer to Kowalski and "Malloy" being injured in that attack.
Toward the end when the heat monster is killed off by Nelson and Crane the blast shield for the observation nose is closed. When the ship is diving to avoid the bomb blast on the ice the blast doors are open and you can see in to the ship.