Not all celebrities look alike, but they do seem to think alike. We asked stars and directors which movies other than their own they were most anxious to see this fall. Can you detect the common thread in their responses? John Travolta: ''Casino is the one I'm looking forward to. When you match up Scorsese with De Niro and add a wild card like Sharon Stone, in Vegas come on!''Richard Donner: ''Casino. I want to see anything Scorsese does.'' Mary Stuart Masterson: ''Casino. I just love Scorsese and De Niro, and I'm always excited to see what they're up to.'' Bruce Willis: ''Casino. Martin Scorsese. He's the man.'' Madeleine Stowe: ''Casino. There's just so much of a rush to Scorsese's films.'' Dennis Franz: ''Casino. I think anybody who's involved in this business has to be an admirer of what he does.'' Rob Reiner: ''I'm curious to see Casino, just because anything that Scorsese does I'm interested in.'' James Woods: ''I hate to say this because I'm in it but just in a cameo: Casino. I play Sharon's pimp.'' And which film is Martin Scorsese himself looking forward to seeing? ''I work in a vacuum,'' he says. ''I don't even know what's coming up. I know Waterworld's come out, but I haven't seen that. Give me a few hints.'' May we suggest...Casino?