New York Times: Anatomies of Scenes (with commentary by directors)
These are great, don't have patience to sit through entire movie with commentary:
https://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/anatomy+of+a+scene/since1851/allresults/1/allauthors/newest/
May hit pay wall:

https://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/anatomy+of+a+scene/since1851/allresults/1/allauthors/newest/
May hit pay wall:

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Comments
For example, listening to the commentary for Singin in the Rain, I learned that Jean Hagen dubbed Debbie Reynolds voice in the scene where Kathy Selden (Debbie) is dubbing Lina Lamont's (Hagen) voice. I find that priceless and well worth listening just for that bit.