What is the relationship between Betty/Diane and Rita/Camilla?

What is the symbolism of the mysterious blue box?

How does Rita's episode at the beginning of the film relate to Camilla's fate?

Why is Diane so upset with Camilla?

What does the monster symbolize?

Is Diane dreaming or hallucinating before her death or are parts of the earlier events in the film real?

How do you interpret the beginning of the film and the final fate of the characters?

Why do so many of the characters overlap in the film?

Why does the Cowboy threaten Adam to force Camilla's role in his movie?

Why does Diane kill herself at the end of Mulholland Drive?

Bibliography

http://imdb.com/title/tt016692

http://dir.salon.com/ent/movies/feature/2001/10/23/mulholland_drive_analysis/index.html