Absolutely, You_Too, your approach is good: look for inconsistencies - I think we already established that the colour settings are quite subjective but when one shot has some colour and then another shot showing the same thing shows completely different colour, it's safe to assume it's a mistake.

I think the way you see colours also greatly depends at how long have you already been staring at your monitor, sometimes I colour-grade something in the evening and it looks fine and then I look again in the morning and it looks off.

Another thing is that letting photoshop balance the image will probably make it look more natural, which isn't always necessarily correct for the film.

@canofhumdingers: Yeah, another thing is that the colours couldn't ever be perfectly consistent shot to shot in the original due to the nature of how colour-timing was done at the time - they would have been pretty much consistent but would never withstand this kind of scrutiny. But I think that it can be said with certainty, that the walls sure weren't consistently deeply cyan like they are in the 04 master, and I think that was accomplished quite well here :-)