David Garth worked on screen tests for this project.
Russell Hunter screen tested for this project.
John Witty screen tested For Lt.Radot (Patrick Young). Jean Serrett screen tested For The French Commadant (Eugene Deckers)
To save costs the Hispaniola from 'Treasure Island' was reused and renamed Lydia but now the ship was rocked instead of the horizon, this caused many problems due to the combined weight of ship crew and equipment.
Alex Davion's role was curtailed because of a schedule clash with another project so his scenes were given to various other actors.
Patric Doonan replaced Raymond Sherry.
Virginia Mayo was only cast after a number of high profile UK actresses were not free or interested.
James Costa was cast as Hernandez and filmed a number of scenes, but was fired because of his salary demands and because the production team were displeased with his acting.
Jack Watson's first feature film.
Leslie Linder, John Benson, Frank Coburn and Basil Appleby. were all suggested for parts.
The rights to Hornblower were originally acquired by Warners with Errol Flynn in mind but after the financial failure of "The Adventures of Don Juan" in 1948 and growing difficulties with the actor, he was not cast. Warners was already building up Burt Lancaster as their new swashbuckler, but the role of a British sea captain seemed out of his range, so Peck was ultimately cast.
Peck and Mayo recreated their roles for a 1/21/52 broadcast of radio's Lux Theater.