The door appears on a rooftop of the Mendez Building, in Downtown on the mainland of Vice City. The door appears in different colors depending on the time of day, and also has a strange, gritty texture to it. The main reason that the door looks very strange is because the texture is transparent, allowing the player to see behind, and this caused the two textures to mingle and create the compressed effect.
To fix this glitch, the player has to exploit a glitch that allows them to walk through walls. Then, the player will need to walk through a building where they will fall to the ground. This will force the game to reload all of its textures as soon as the player lands. Once the player goes back onto the roof, the door looks like a normal, white, non-transparent door.