I wasn't expecting much when watching Who Done It?, because it had Benny Hill as the male lead. And I only knew Benny Hill from his "Yackety Sax" sketches where he mostly chases after scantily clad women.
Turns out he was a solid actor; and he is perfectly cast in this film as the hapless wannabe private eye.
And the DP was Otto Heller, which is why this film looks better than it needed to.