A few months ago, I pointed out the Amazon.com seemed to be deliberately hiding recognizable names in the cast lists of Albert Brooks movies, among some other films.
Apparently, others have noticed. Check out the complete title of The Third Man as it appears on this Amazon page.
(Whoever vandalized that page, however, would appear to be technically wrong. Those actors do appear, according to the IMDb listing, though they're not credited in the film.)
UPDATE: I see Amazon page got fixed. For a while there, the title read: "The Third Man -- You got the cast list completely wrong."