re: Mary Poppins -- it's been my experience that Disney's clean-up is only extreme with their animated features. Pete's Dragon featured minimal DNR as well as I recall.

As for TLM, well I hope those are mistakes but I wouldn't be surprised if they were intentional. I can't help but laugh at people who are calling these SE-level changes, though; for all we know, these could be the result of this remaster being sourced from a different print. Even SW pre-new crawl had variations here and there, after all.