An old British film "The Ghost Camera" (1933):
Very early acting role for the leading lady Ida Lupino who later directed quite a number of films.
The film was edited by David Lean before he became a major film director.
Very early acting role for John Mills who was in quite a number of David Lean's films - this would be the first time.
So for a film you are unlikely to have ever heard of or seen, it's quite a notable film.