The top mistakes in The Cruel Sea http://www.moviemistakes.com/film1771 en Sat, 22 Nov 2008 06:55:08 +0000 13313 Just after the Royal Navy destroyer has sailed through and depth charged the area where the British survivors are, there is a shot of the churned up sea with sombre music playing, and the seagulls are flying backwards. 118012 The Royal Navy named ships in line with the class of vessel that was being named. Compass Rose was a Flower class corvette, so should be named after a flower. At the time 'compass rose' didn't refer to a flower, but only to the pattern of directions shown on a map or compass, so the name would be inappropriate. 'Compass Rose' is now a recognised breed of rose, but it was only introduced in the mid 1990s. 12636 One of the depth charges used to try and sink a German submarine is clearly marked "inert filling" so it would not explode.