I thought this was such an amazing film and I could never really tell what was real and what wasn't. When the explosion in the closet happened though, I predicted that it was in fact a teleporter but for a lot of people that was probably an unexpected result.
Some out there say that they thought it moved too slow but for me this film was at a perfect pace. One of the best of the year IMO.
Not once did I feel it was slow, just felt like a regular film to me. Even the runtime wasn't too long. I recently saw Train Dreams which was much slower but also incredibly beautiful.