This commentary track, recorded exclusively for the Criterion Collection in 1996, features director David Cronenberg, Jeremy Irons, editor Ron Sanders, production designer Carol Spier, and director of photography Peter Suschitzky.

This featurette includes behind-the-scenes interviews with David Cronenberg, Jeremy Irons, and more.

The following footage shows the split screen, generated by the on-set video system for the most difficult of the motion-cointrol twinning setups: a reverse tracking shot of the twins walking toward the camera. Irons performs Beverly “live” on the left side of the monitor. His previously recorded ...

In another motion-control shot, the camera dollies in slightly on the stupuorous twins as they engage in a bizarre birthday celebration. To compensate for a slight change in camera angle during the move, the split had to be panned slowly as the shot progressed. Footage from the videotape reveals ...

A complicated motion-control shot that looks deceptively simple involved a pan from Beverly to Elliot, with a change in focus. Here, Irons plays Elliot against acting double John Bayliss as Beverly.

In some scenes, Jeremy Irons performed both parts without his acting double. Here, Elliot Mantle discovers that Beverly has used the gold Mantle Retractor to examine a patient. A motion-control shot panned from Elliot to Beverly and back again. Beverly was filmed first.

In another sequence, Beverly and Elliot wander aimlessly through the clinic babbling incoherently of plans to reverse their self-destructive course. A motion-control shot has the camera dollying down the hallway as the twins parade past three successive doorways. To keep the seperately photograph...

In only one of the split-screen shots was it necessary for the siblings to appear as though they were physically touching. For the final sequence in which a roaming camera comes to rest on the twins rejoined in death, Cronenberg wanted Beverly to be found draped across his brother's lap. Crucial ...