Who is he, /tv/?
The "lost highway" is the limbo experienced by Fred in jail where he imagines himself as Pete as a form of escapism to cope with his murder of his own wife. The Mystery Man resides at the end of this conceptual "highway" to snap Fred back to reality, where he is no longer Pete, tragic hero who happened upon a life of evil, but Fred, the evil murderer who killed his wife.
The personification of jealousy or a supernatural entity.
He is a part of your mind. He is the way you remember things.
The main character says he dislikes cameras because he "prefers to remember things his own way". However, cameras, of course, are an excellent way to remember things YOUR way and change "the truth" to how you see fit. (this is a theme Lynch also explores in Mulholland Drive, particularly the sequence in the theater).
Yes, that's why the Mystery Man uses a video camera. Notice how the tape of Fred "killing" his wife does not actually feature him killing; only him sitting near her corpse.
The footage can both be interpreted as him post-murder as him finding his wife's body and lamenting her death. That's the power of the camera (and the editing that comes with film), and also the power of the mind (the way we remember things).
True, but it's weird that Mulholland Drive got a much more positive response considering they both have a similar approach to narrative structure. It was probably the lesbo shit.
I don't really care for Mulholland Drive, but MD is a bit more of a fun movie to watch and it's quite a bit more refined; LH is sort of messy and has this ugliness over it that MD doesn't have. LH is also painfully 90s, which was already apparent back then.
whats so good is that its presented literally
so if you want you could totally see it as an art piece or a spookfest
personally I liked Mulholland Drive better as an twilight zone esque movie with a mystery forever locked away by a strange blue box that alters reality to fit terrible implications