Harmy said:

I would recommend using 23.976fps instead of 24fps, because 24fps can cause playback problems. Ady made his EpIV AVCHD 24fps and I know there were people who had to remux it to 23,976 in order to play it.

I've also read that playback of true 24fps can be problematic. I believe that the majority of Blu-ray Discs are encoded at 23.976fps?

Since a 0.1% difference in speed is negligible, and Puggo will be re-syncing the audio anyway, it would be wisser to go with 23.976fps. The AviSynth command is then:

AssumeFPS("ntsc_film")