Mulholland Drive is a movie that's more complicated than it initially appears to be and was a labor-heavy job for star Naomi Watts, who played two different characters in the film. The one that gained her entry to this list was struggling actress Betty Elms, who doesn't see herself as gay but nevertheless finds herself falling in love with a woman with a mysterious past. As the character wasn't gay when the film began, casting a heterosexual woman into the part may have made more sense here than it did with other movies we've discussed.
Watts has been with actor Liev Schreiber for fifteen years in real life. The other character she plays in the film, Diane, may also be gay; although this is never explicitly confirmed on screen. True to the style of director David Lynch, much of what happens in the film is open to interpretation, with no right or wrong answers.