Bogart does a good job pretending to be someone else in a bookstore talking to a pretentious clerk. The movie is very close to the book, although it had to be cleaned up somewhat. The book is about a pornographer to rents porno picture books from his bookstore. The book is fairly explicit about nudity and homosexuality and now comes annotated, explaining all the slang words from the early last century.
Finally, the car Bogart drives is so cool: it's a 1938 Dodge couple. The dialogue is great and the humor also wonderful. Of course there are great scenes between Bogart and Bacall.