Not particularly DMT-related, but here are a few more:
Pan's Labyrinth (Mandrake makes an appearance, not to mention the rest of the movie)
Land of the Lost (the psychedelic binge in the desert at the end)
Domino (the group of bounty hunters are served mescaline-spiked coffee or tea around the ending, they swerve off the road and trip out in the desert)
Rango (the walking cactuses, the wise old armadillo, there's even a direct reference to Fear and Loathing right at the start of the movie where you can see Rango ending up on the windshield of The Red Shark, with Raoul Duke behind the wheel with the iconic cigarette. Not to mention the fact that Rango himself seems modeled after the Fear and Loathing poster:
The Imaginarium of Dr. Parnassus (if this movie does not have DMT as an inspiration I don't know what is)
Shrooms (the horror movie, title says all. Haven't seen it, supposedly it's pretty bad, it is about mushroom-picking teens getting butchered. I read that they reference the mushrooms as being deathcaps, just to make it sound more ominous. Ah well..)
The Holy Mountain
Oh, and there is an episode in the TV series Weeds that has an Ayahuasca scene. Can't recall which season though, either 2nd or 3rd I believe.
Another movie that I found highly psychedelic (although none are specifically mentioned): Pi ( 1998 ), highly highly recommended!