The title of the film is 'How to Lose Friends and Alienate People'. Step one wouldn't necessarily be 'make a bad film' but I'm sure it couldn't hurt.
This film reminded me so much of Ben Elton's dreadful 'Maybe Baby' in its poor direction and terrible story development that to think about it much more would only serve to make me angrier.
I haven't read the book and now I never will. The characters had little to no development and there were so many travelogue type establishment shots of New York that there was a moment I thought the director must have gone to the Ed Wood school of using found footage but he had obviously never graduated.
I could go on but I think you get the point. Avoid this film.