Plz tell me whether what im about to audition for is a scam...!

I got an audition, i think, the producer just said to come to the place and there he will decide who gets it. This is the letter, The headshot need not be professional. << (thats the reply to when i told him i did not have a proffessionally done headshot) Here are details: Thanks for your interest in this feature film. I am holding a meeting for key people who want to be involved. The time and address is:530pm December 19th 525 Harris Street Ultimo (ground floor) - it will run until 630 and it is here that roles will be allocated. If you have any photos in hard copy, it would be beneficial to bring them here. If you need to be in touch please contact me on 0411719997. Best regards, Scott Free Producer, SLAG BEST ENEMIES Sent from my BlackBerry® from Optus I read the advertisement from seek.com I dont know whther i could trust this person, also it said in the advertisement that i wouldnt get paid upfront and will get paid once the film starts making money. What kinds of thing should i be looking out for to make sure this isnt a scam. This is the link to the advertisement, http://seek.com.au/showjob.asp?jobid=11343678 pleas ehelp me so i dont fall for a scam. Im a little suspicious of this "audition"