Continuity mistake: Marlowe sits in front of Joe Brody's apartment building, The Randall Arms. Later as he follows the gunman that shot Brody we see it from inside the car and the registration stickers are different.
Continuity mistake: After driving Lauren Bacall home from Eddie Mars' place Marlowe walks into his apartment and we see the number 206 on the door. In the next shot from inside we see another door that doesn't have 206 on it.
General Sternwood: Do you like orchids? Philip Marlowe: Not particularly. General Sternwood: Ugh. Nasty things. Their flesh is too much like the flesh of men, and their perfume has the rotten sweetness of corruption.