I would really like to see approaches like these applied to movie scenes. Especially how differences in single colorized frames depicting the same scene could be handled.
Found a video [1] colorized with the approach by these guys with the unstable coloring.
There are some other videos [2][3] colorized using differing approaches, that don't seem to have as much color unstability though the color in general appears more off.
Could of course also just be a property of the underlying source.
[1] https://www.youtube.com/watch?v=__kcHbzSNC4 [2] https://www.youtube.com/watch?v=_MJU8VK2PI4 [3] https://www.youtube.com/watch?v=qQSViqdd0tU
Certainly colour correction, hue, contrast, brightness, would be easier to process than adding colour in the first place.