Edit- I don't remember seeing this ticket mentioned:
Visit the Feed-A-Pet booth in the cafeteria building 10 times, then go to the souvenir shop, click on the "Click Here to Shop" sign, go back to Movie Mountain (you don't have to buy anything!), and go back to the souvenir shop. That's how I found my 8th ticket, anyway.
I got the tip from this guide: http://neopets.com/~kaiadjo . Slightly different directions than the method I used, but something worked.
Edit: Just to clarify, when I found the ticket in the souvenir shop, it said it was the Feed-A-Pet ticket. Hence my puzzlement.









