We are shooting a comedy feature length vampire film with many film references. The script calls for the first victim of the movie to be wearing a red Star Trek shirt, with Star Trek posters on the wall. Can we do this? Also we have a scene in a comic book store with a Stan Lee look alike. The scene calls for teens to be playing Dungeons and Dragons, one of the teens is wearing a yellow cheer-leading uniform and her name is Buffy. Is that a problem? Is that a problem? Thanks.