Thought this was quite cool. *promote

Self promoting this video and sending it back into the queue for one more try; last queued Friday, July 4th, 2014 6:10pm PDT - promote requested by original submitter eric3579.

*art

Not really a mirror?

Adding video to channels (Art) - requested by ant.

I'm guessing that either the mirror was a green screen, and they managed to seamlessly combine the two shots, or the mirror was actually a glassless window to an identical room, and they added the second Jared Leto in post. Or maybe there's an invisible cut when the camera pans with the first Jared Leto, and when we see his back we're actually looking at another actor, and the real Jared Leto is standing behind the fake mirror. I dunno. It's pretty seamless.

Great movie, by the way. Really ambitious and super stylish (but not in an overbearing way).

The green screen idea is the easiest way in this situation; if you notice, the mirrored Jared doesn't completely synchronize with the actions of the first Jared. The mirrored Jared did that shot facing a camera instead of a mirror, and then the mirror was replaced with a greenscreen for the beginning of the shot. Once the camera zooms in past the mirror frame, the greenscreening effects are no longer needed.

Similar?

http://www.youtube.com/watch?v=xlDXQdgx_QU&t=5m55s

There are a lot of ways to do this kind of shot that don't involve any kind of greenscreen. Unfortunately I can't think of any good examples at the moment, it's been more than 15 years since I had those classes in college, but I saw many from mid-century 1900's (lots of Hitchcock for one) that showed how they'd work around camera visibility and such.
Meh, that wasn't a helpful comment, was it? Well, at least you know... something! Plus it's good to know there are ways to achieve mind-bending visuals that don't involve CG. Pre-CG-era filmmakers were quite clever.

Something looks off at the 16 mark not sure if its the youtube quality or its like that in the movie though.

Well, looks like compositing. Leto's actions don't synchronize perfectly as they would in a real mirror. From my experience working in film:

Looks to me like the shot the beginning part as a composite shot, basically on green screen, or even on the real set and rotoscoped. The shot through the mirror was the actual long take. There was no mirror, of course, and after the camera approached the wall, either the matte or set was pulled away from camera to allow the camera to go through. Possible reason for the camera pause being technical rather than story driven.

If you look at his arm, the foreground Leto reaches out before the mirror Leto does. Also, given the style of lighting on foreground Leto, which doesn't match mirror Leto, to me suggest they were lighting for a green screen. That's a typical light setup for ideal keying.

#1 the shots are synched fine, it is just your mind manufacturing evidence.

#2 Leto (?) is using one shot and 2 cameras so that #1 is a realistic reflection.

#3 the mirror doesn't exhist and is chromakey, it is also where the 2nd camera is located.

#4 Lighting is as you would expect from any tv/movie production. Artificial lighting in these productions are horribly unrealistic with tons of hidden lightsources coming from above.

It was most likely done exactly like this one: http://videosift.com/video/Contact-Tricky-Mirror-Scene-Where-Is-The-Camera

Which is to say, a green screen and two separate shots that line up well enough to fool anyone not paying extremely close attention.

2 shots. A side has greenscreen where the mirror is (there are edges, lack of hair detail and the lighting is different on each side). the B side was shot with no wall, stabilized then tracked to the A side until leto clears frame and then goes back to it's own movements. i'm pretty sure the push into the mirror was done in post as well.