How many actors are there at the haunt? It could be that there are so many people working in the haunt, that you just blend in with the crowd. Another reason could be that the owners/coordinators don't know you personally or you haven't spoken to them face to face all that much. As for getting the position you wish to get, well, it isn't always about who wants it the most. It's usually about who is able to play it with the right angle, with the right demeanor, or who fits the right physical build. The latter doesn't always apply, but sometimes that's what the owner wants. Other occasions, the position is first come first serve. If what you are given isn't what you had in mind, then talk with the person in charge of signing parts. Say that you've been thinking about doing "this" for one night and if there's anything specific they'd like you to do or say. Something the other guy might not be doing or doing well. If you get the position, then at the end of the night ask the person you were just talking to if what you did was good enough and that maybe you could run with it for the rest of the season. If you are still unable to get the spot and there's something you'd rather be doing than acting a "lame part", then ask if there's anything else they could use you for.