Edit2:
Tech note bout frame rate. The
Moc version runs 20fps in a "clean" pattern of one dupe out of five. As far I know, spanish
Divisa Red edition of the same material was authored at 19.2 fps giving of course a 4% of diference on the running time...(Beaver`s review wrongly speaks of "Pal speedup"

)
.... So the decimation wasn`t hard (I`m playing now with a bloody Garbo pic with 33 dupes out of 137 frames=22.75fps, that`s ugly) BUT...randomly. and in some of the more damaged parts, you`ll find inconsistences on the pattern i.e. with 3/4 or 5 dupe frames, always at the end or begining of a take (never in the middle)...I don`t see this as a DVD authoring problem of the source but as a restoration choice to get closer of the original number of frames and duration of the damaged fragment. Short, those parts cannot be decimated, they`re as in the DVD and mostly in the more damaged parts of the material.
Some examples...
1) when the fog goes out and we see Faust for second time : missing frames of the transition (4 dupes)=violent aparition of "alchemist" Faust.
2) when the devil spreads the Plage over the town you can spot a repetition of the frames the second time (3 dupes)= small freezing of the plague

3) when the public looks over the dead face of the clown (3 dupes)...