I haven't watched the videos but I can tell you after a year of knitting, I've only recently realized that I don't have to frog all the way back to a mistake anymore. Now that I understand how to fix mistakes with my crochet needle, I'm not frogging as much.
FWIW, my mistakes tend to be purling where I should have knit and vice versa. I tend to make a lot of patterns with K2 P2 ribbing and my ADD brain tends to forget where I am. Of course I could just look at what I'm doing to know which stitch to do, but when I start talking while I'm knitting, forget it.