Most unrealistic parts
This movie completely lost me over two unrealistic events. First, how was Wyatt able to pop up in Jonathan's bedroom? That's simply ridiculous. He would have had to break into the apartment, hide somewhere in the bedroom and sit there for who knows how long without making a single sound until Jonathan woke up.
But even more ridiculous is the climax in the park. It's central Madrid in the daytime, Wyatt pulls out a gun, Sunbeam shoots him before he can shoot Jonathan, he dies in a pool of blood AND THE PARK IS EMPTY AND NO ONE NOTICES!!!!!! GIVE ME A BREAK!!!!! I have been to Spain and I have never seen a park completely empty on a nice day. And then Jonathan just casually walks away from there to go woo Sunbeam.
Right.