Well since I accidently posted a 2nd post (see below) I may as well use this one to explain the theory behind the blended frames...

Your source is hard telecine 60i NTSC material (2:3 pulldown). Although very easy to completely remove now on any home PC, instead of being a perfect IVTC job, every so often you have a completely "random" blended field here and there because the process thought that was the progressive one.

Anyhoo, this is then converted/resized to PAL (field by field), and as such you shouldn't actually have blended frames, you should only have blended fields (unless it was authored as progressive and then you might have a problem!)

Then you have the effects shots. Because they were done at 30fps, you now have 24fps and 30fps material laying on top of each other (yuck).

But what if the material is actually not sped up? Okay first we have random blended fields resulting from a poor IVTC, and then we will have 1 blended frame per second.

Okay, there's a simple description of the problem and how it happened. :)

How to solve... you go through and yank out all the blended fields, and then put the frames back together, interpolating where the missing fields are. Simple. Well except for the effects shots because you only want to remove the blended 24fps fields, not the 30fps ones (in other words, if there's a blend in the effect but not the action you ignore it and accept it as being inevitable). And if it hasn't been sped up you simply remove the extra frame.

Srestore for AVISynth was made for this exact purpose. Well except it will prob identify blended effects as blended fields and you don't want that, so you'll need to do the effects shots - and only the effects shots manually.