OMG - A Double Bed!
In Sam Spade's apartment when he leaves Ruth sleeping we see her sleeping in a Double Bed! All the older films I've ever seen lead me to believe there were no such things. Heck, even long term married couples were shown sleeping in twin beds. And not only that, but when the camera peels away, we see the side next to Ruth showed the other pillow with a head indentention, as well as the indentation of a body on the mattress and rumpled sheets.
Wow, imagine, a movie strongly intimating two people slept together in one bed...and they weren't even married on top of that!