"Track of the Cat": shot in colour but everything in it is black and white apart from Robert Mitchum's shirt.
"Wicked, Wicked": shot in DuoVision which split the screen vertically for the whole movie giving two different viewpoints throughout. Needless to say it didn't catch on.
"Rope": shot in what appears to be a single take. The visual equivalent of holding your breath for 80 minutes.
"The Lady in the Lake": shot from the hero's POV so we never see his face until he looks in a mirror.
"Brainstorm": whenever anyone uses the brain recorder the screen expands into extreme widescreen format. Great at the cinema but on tv not so much.