Continuity mistake: Adrian and Le Borg are flying on a modern-day commercial jet. Just after the explosion, there's a quick aerial shot of the plane plunging from the sky. However, the airplane in the scene is definitely not a jet, as seen by the shape of the wings. This appears to be stock WWII film footage of a military fighter plane that was shot down.
The List of Adrian Messenger (1963)
1 mistake - chronological order
Directed by: John Huston
Starring: Kirk Douglas, Burt Lancaster, Robert Mitchum, Tony Curtis
Genres: Mystery
Marquis of Gleneyre: Had a brother who went to America once. Canada, actually. Before the first German war. Suppose he's dead by now. Almost everyone is.
Trivia: In this rather clunking classic murder mystery, the closing gimmick of the film is a sequence of several otherwise unremarkable supporting characters grandly removing their heavy latex makeup to reveal A-List Hollywood movie stars who played mundane roles in the film. The heavily-disguised stars in this film include Kirk Douglas, Tony Curtis, Robert Mitchum, Burt Lancaster and Frank Sinatra. Director John Huston (who also made a cameo appearance in the film) tried to convince Elizabeth Taylor to play a disguised part in this movie, as well; but, when Taylor learned that her lovely face would be completely hidden under heavy latex, she turned down the role.