Dark Sky Films Dvd

I own the dvd that was released a few years back by Dark Sky Films. On the whole I am happy with it - the transfer is excellent and the extras include a trailer, radio spot and 2 documentaries SIMON SAYS (interview with Andrew Prine) and MAKING WHITE MAGIC (interview with director Bruce Kessler). What I would like to know is why if they were able to interview these 2 men for the docos they couldn't get them to provide a commentary? Very disappointing!