I haven't seen this reported and it's happened in more than one game for me, so I thought I might mention it.
When I pimp for Romero (my mother would be SO proud!), the wrong prostitute is in the cemetery. The default one in the red dress, to be precise. I figured that it just wasn't set to spawn the specific model I had with me, but I also noticed that every time I entered the cemetery after this quest, she was standing there. That was only in one game, I think, but I haven't tested it further.