Color autocorrected on my Canon G10 in the middle of filming, any tips for editing in post?
Not easily.  You would need to apply a color correction to try to replicate the change.  If you can use the color correction to get the beginning and end pretty close, you can then use keyframes to have it blend between them and hopefully overcome the adjustment, but results are still probably going to be so-so and it isn't trivial to get even a mediocre fix.