The movie uses a simple wave effect to suggest the parallel universe jumps (they're reversible) There's a scene late between Danny and older-self Zach with an enormous moon that reminds one (or anticipates) of Lars van Trier's approaching planet Melancholia. Prescience? Coincidence?
The movie does start out with a light touch (involving Zach and his "present day" (or "alternate universe") "lover", which turns out to come from a plot twist. You expect the movie to be a comedy or satire, but it rapidly becomes more serious, and approaches thriller territory -- an interesting shift of pseudo-genre.
Does it make sense to ask yourself, can I have a second chance, go back to my youth and get things right and become much more successful -- and happier? This movie takes a shot at the question. Is the time-arrow of physics absolutely irreversible? Maybe it's only entropy that limits us.
Make no mistake, this film is a masterpiece. I could have been in there with all the heavy hitters at awards time. The Academy missed this one. It needed more aggressive theatrical marketing.
Not rated, probably on the borderline between PG-13 and R; the story and acting tend to downplay material that would otherwise seem explicit.
Technically, the film was shot with a large portable camera in a somewhat Dogme style, a bit like a Lars van Trier film.
I love the main song "Crash" aka "Listen Now" in the film. Have I heard that on Sirius XM? (Note comment on the name of the song below.)
Picture (above): mine (not in film).
Below: from Q&A, at St. Anthony Main Theater (formerly the Reading), Minneapolis.
There are some films about the Biblical Judas, to be sure. There is a 2006 National Geographic film "The Gospel of Judas" (dir. James Barrat) about a lost book for the New Testament, and a 2004 film from Paramount for ABC "Judas" with Johnathon Schaerch as Judas Iscariot and Jonathan Scarfe as Jesus. There was also an unrelated "Judas Kiss" from Key Entertainment in 1998.
Update: July 20, 2012
Here's an interview with actor Richard Harmon, link. He's a stunning young actor.
Update: April 11, 2014
The theme song by Brian Lam appears to be titled "Crash". The words include the words "Listen Now" a lot, which I used to think was the title, but that's the title of another Metallica song associated with the phrase "Judas Kiss" (not sure what the connection means). The right way to look it up online is to use the title "Crash". It has a wonderful lilt, somewhat reminding me of "Let It Go" from Disney's "Frozen". Wikipedia has a list of all of the original songs from "Judas Kiss", which is quite impressive for this "small" film.