The Region 4 version of this disc misses out on;
Addendum 29th April 2000:
Canadian Region 1 version:
It has been brought to my attention that there is another Region 1 version of eXistenZ available, in Canada. It boasts not one, but three audio commentary tracks; Director - David Cronenberg, Cinematographer - Peter Sushitzky and Effects Supervisor - Jim Isaac, plus a 50 minute behind the scenes documentary called ‘The Invisible Art of Carol Spier’.
If you do not mind the loss in picture resolution associated with the NTSC format, then this version would definitely be the way to go.