The Samsung Omnia challenge

Watch the viral Samsung Omnia video below, and let me know how they did this:

The hint is after the break.

The video was almost perfect, with the exception of two fatal mistakes at 00:47:

Notice that in the word Samsung, the S is not mirrored? Also, the hands do not meet as you would expect if you touch a mirror. The setup is easy as there is a hole in the wall masked with a mirror. On the one side you have the actor, and on the other the camera man.