When letting to do DGpulldown for 23.976 -> 25, video has "pulse" effect every 9th frame or something like that. It is most noticeable with hard encoded bright subtitles. This happens for original built-in movie subtitles too (ending credits for example).
This GIF animation shows the pulse effect. It is a bit slower actually, but couldn't time it right for GIF.
http://personal.inet.fi/koti/kst/testi.gif