Stranglehold Easter Egg - Secret Cinema

(I found this in my PS3, but I think it has to be on the XBOX 360 game too)
In chapter one, you reach a market where there is an scene in which the character finds the envelope with the picture of the murdered cop and the 'White Rabbit'. After the scene, you have to fight with many enemies. When you kill all of them, you have to go through a street killing more 'friends' and at the end of it, you encounter a guy with a shotgun and two other guys appear from the left door you must go through to continue the game.
OK, now we're situated, let's find the egg.
After entering this door, you will see a wooden door on the right of the passage. Break it by bullet method and continue through the new 'street'.
You will reach a cinema where two trailers of other videogames are being played and where there are many weapons, including Golden Pistols.