Darth Mallwalker said:
It just struck me as strange since I thought I remembered the Miami festival requiring NTSC.

As I remember it, it goes like this:

JD's original "master" in FCP is PAL 25fps; it was sourced from the Region 2 DVD (with sections from my PAL laserdisc transfer).
His original version released in 2006 was PAL.
Someone - Boon? - converted this to NTSC.
JD created an updated version for the Miami Film Festival
He sent the raw audio/video files to me to carry out a PAL->NTSC conversion, because the Festival required NTSC. I did the conversion based on a simple re-encode/slowdown of the progressive frames to NTSC framerate and resolution.
However, there were some issues with this - IIRC some scrolling subtitles were interlaced and became illegible after conversion.
Not sure what JD did then - he may have contacted the festival organisers to ask if PAL was OK, or he may have attempted an NTSC conversion himself.
The disc I recently received from JD was in the form of a fully-authored PAL DVD. I haven't compared the documentary on this disc to the raw files I received earlier in the year, so I can't say whether it's exactly the same... :-)