If you develop these negs as b&w negs, color crossover is hardly an issue. If you do the full C41 process, you need to balance three color layers in lock step, which, according to those who tested this with control strips, can only be done at 38°C/100°F but not at room temperature. If you go the hybrid route, digital post processing software can restore the correct colors and often does it automatically, so you'll never notice that your C41 negs weren't developed correctly. You will notice it, though, once you try to enlarge optically, since you can't adjust contrast of individual color layers that way.
I see, I don't know the method he used. I assume it was a scan, the reds were really great and browns true, the scenes were of a sandy beach and a red boat or tractor or something.