John Landis likes to put directors in his films for fun.
It's all in this: http://collider.com/the-collider-interview-john-landis-part-ii/

Just watched this yesterday for the first time in over a decade and noticed several cameos. Spotted Bob Sherman and George Lucas, then checked the cast and noticed some other familiar names (Ray Harryhausen surprised me).
Fun stuff.

One of the few times I have seen him in front of a camera.
Lose the Game!!!!!!!

George was just getting used to selling his soul and integrity to a theme park cough Disney
And so, God came forth and proclaimed widescreen is the best.
Sony 16:9

It's a cool cameo cause he looks fantastic. That's the way I wanna remember George.
"I said no camels, that's five camels, can't you count?"

George Lucas needed the money, I don't think he made much from Indiana jones and Star wars trilogy and doing post production on Jurassic park
"sticks and stones may brake my bones but whips , chains, leather and tight pvc excite me"

Yep, director Barbet Schroeder was also in there.

It was Lucas. Landis used many directors in cameos in this film, as he does with others.

Director John Landis is famous for casting other film directors in his films, such as An American Werewolf in London, Spies Like Us, Coming To America, Innocent Blood, and Oscar just to name a few.

There are a bunch of cameos in the film.
George Lucas, Joe Dante, Al Green, John Singleton was a firefighter, even Uncle Dave was played by Wilbur from Mr. Ed! Many moore I can't think of off the top of my head, too.

"If it wasn't lucas then it was his identical twin. Did anyone else notice this?"
It is indeed George Lucas, and Testament tells the reason why

true.
joe dante was also in it.
not that i expect anybody else to be as much of a dork to recognize joe dante.
but man, gremlins is awesome.

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