Liam Redmond plays the part of "Chief Engineering Rating\\C.E.R. WATTS." However on at least two separate occasions both the ship's Captain Ericson (Jack Hawkins) and later Coxswain Tallow (Bruce Seton - 11th Baronet of Abercorn) clearly call him WATSON.
After the British sailors have been depth-charged by HMS Compass Rose, the seagulls converging on the corpses can be seen flying backwards. This is due to the cameraman sailing towards the scene in error when it was shot; the film was simply reversed to give the required effect.
In the opening scene of the film where the captain joins the ship it is obvious that the paintwork is filthy and smeared with numerous oily hand prints where the door has been closed. In other scenes aboard "Compass Rose" the paintwork can be clearly seen to be chipped where it has been knocked. Unlikely in a brand new ship that has never left dock before!