The Tongues (Spoilers)
I can't believe I can't find a topic about this. I know the humor was unintentional, but it really took me out of the film.
After Brenda Blaney is sexually assaulted and murdered, the camera immediately flashes to her face with her eyes wide open and tongue hanging out to the side so unnaturally far that no one could take it seriously. It was like the expression someone would make in jest when spoofing a strangling death. The woman at the end had the same crazy face.
I can't believe a any self respecting director would think that didn't look ridiculous. That face, after a traumatic scene, was utter comedy. It was a joke, and not in a good sense. I was actually embarrassed for Hitchcock. Maybe times were just different, but I can't ever see that expression as not being ludicrous.