Originally Posted by Master Finch
What are those references to? I've only ever heard of the Wilhelm scream, and they tend to use that when they cbf to get the voice actor back in and make him scream. Bowchikabowow.
The first one is a phone number, I think, George knows. The second one is George's first feature film THX-1138, and the third is the sound producer Ben Burtt's signature that he places as a joke in all of his films. Including all Star Wars films.