I don't think it's illegal. I'm pretty sure that if George Lucas might have sued them, they wouldn't have talked about Star Wars in Clerks. Ditto for pretty much any pop culture reference in the movie.
However, when they did the TV Show, they had stuff like the Down With Paul Reiser shirt that the network thought would get them sued.
So basically, just talking about them is fine. The only reason they'd have any reason to sue you would be if it were negative, and even then you probably won't get sued.
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