A lot of times the no additional sense error occurs when the data size is still set at 4482MB, but the actual disc size is something less than that. In effect, it's trying to scan the "non-burned" portion of the disc, hence the error. The fact you had no issues watching the movie would seem to sonfirm that. I always eject my burned disc and re-insert it prior to a quality scan.
As for your figures, in general, I've found that PIF at or below 8 do not pose any problems on any of my stand alone players. A spike in a single sector, even up to 12 or so generally doesn't cause a problem either. Multiple adjacent sectors with PIF spikes above 8 often cause problems, and often above 12 for several sectors will cause a complete freeze, especially on picky players.
PIE can generally just be ignored, unless accompanied by the aforementioned PIF spikes. I've had PIE spikes of 300 or more with no noticeable issues. As for media, my 1650's are the least picky, even with lower quality media.