I loved the snarky dialogue between the bad guys and Marlowe. He acts so serious when he makes funny dialogue. Some of his lines pop out like he's self aware of being a character in a crime novel. he Even jokes about being a private detective with Carmen. the funnier part that stick out to me is the scene in his office with Vivian, where Bacall seems to want to scratch her leg and Bogart says "well go ahead, scratch it" it seems to me that this was a blooper of the actors, but they left it in for humor between the two of them.
One of the more humorous lines is when he encounters bad guys and either disarms them, is caught, or gets the last laugh.
[Marlowe]Somebody's always giving me guns.
[Marlowe] My, my, my! Such a lot of guns around town and so few brains! You know, you're the second guy I've met today that seems to think a gat in the hand means the world by the tail.
[Canino] What's the matter? Haven't you ever seen a gun before? What do you want me to do, count three like they do in the movies?
[Marlowe] I can do what? Where? Oh no, I wouldn't like that. Neither would my daughter.
[Marlowe] I hope the sergeant never traces that call.
These are my favorite lines, I also tend to think the filmic conventions used to try to get us into Marlowes head are interesting, such as when we see him trying to keep track of Geiger in the bookstore across the street. his actions are very literal and interpretated i could see the book narrating this scene as I was watching.