It contained a blooper reel at the end .Harry Potter told a good joke in the trailer .It showed nothing of the actual movie .It was the flashing title screen for the wrong Harry Potter movie .
Why was the Harry Potter preview so funny ?
dark knight is so much better in imaxi could see every pore on everyone 's face aaaaaaaaathe harry potter preview was lulz , it was literally the harry potter title flashing on the screen , staying there for two seconds , and then it was gone .