According to the following article, Leonard Nimoy, an actor like many has worked with JJ Abrams on other Bad Robot Productions, has an un-credited cameo in the film Super 8.
J.J. Abrams has revealed that actor Leonard Nimoy appears in Super 8.
In an interview with Collider, Abrams stated that there are a number of hidden features in the highly secretive movie, including the Star Trek actor.
"Leonard Nimoy is in the movie somewhere if you can find him," Abrams said. http://www.digitalspy.com/movies/star-trek/news/a323471/jj-abrams-leonard-nimoy-is-in-super-8/
I have never been able to find the cameo and was wondering if anyone has ever found it/knows where it is?