The scenechanges are easily explained. The source was probably smart bobbed to make it progressive before converting it to pal framerate. And it was a really shitty filter as is customary in PAL dvds. So even static detail is discarded near scene changes for no real reason and dotcrawl detection doesn't work when fields are interpolated.
The dotcrawl most likely existed in the NTSC source that was used as input for the PAL conversion. So then you destroy the original dotcrawl structure and also any possibility of recovering detail. Blend two adjacent frames together and the dotcrawl is still there.
I guess what I'm trying to say is that your source material is shit and death is the only way out.
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VapourSynth - proving that scripting languages and video processing isn't dead yet
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