On side "A" of the disc, select "Languages". Arrow RIGHT. You should have just highlighted a small box in the frame of the slide. Select this to reveal a small Behind The Scenes clip!
On side A, go to the chapters menu, specifically for scenes 13-16; arrow DOWN until the green box highlights in the top border and press ENTER. A commentary about extra dialogue will play.
Doing the same thing for scenes 25-28 takes you to a Jim Cameron commentary on Stan Winston's SFX; for scenes 29-32 Jim will comment on cyborgs in general.
From the Main Menu accesss the Special Features Menu. Highlight the 'resume film' button and press DOWN. Access this to reveal a behind the scenes clip with Michael Biehn!
All easter eggs were generously submitted by Satelk