DavidMerrick said:

Yeah, I mentioned in the Star Wars DE thread how some orange blotches could be seen on Mark Hamill and Harrison Ford's faces at times. Harmy said the actual discolouration was due to limitations of dealing with the official BD transfer, but those blotches are very clearly over-applied makeup. Filmmakers in 1977 weren't anticipating a future of Blu Rays and 4K, so some of these details weren't meant to be seen.

As I'm typing this I'm feeling even better about these restorations.

There were similar problems with other restorations using the OCN: with The Wizard of Oz, the wires that were propping up the lion's tail were visible and they had to digitally erase them. The same issue came up with The Godfather Part 2 where the wires for the squibs were visible in the scene when Fanucci is killed by Vito.