I'm working on crocheting a baby blanket. I re-did some of my crocheting cause I had crocheted on the back side of a granny square; I put some of the big squares (4 smaller squares sewed together) on backwards on the strip of 4 big squares; I had started to crochet 4 dc's in the corners of the granny square and put the 1st 4 big squares together which doesn't quite lay flat so I decided to crochet 5 dc's in the corners of the granny squares instead of 4 dc's and then on the 3rd time around a granny square w/dc I put 5 dc's in the corner when I didn't need to. I only needed to put the 5 dc's on the first rnd around the granny square not on the 3rd rnd.

Why did I make such simple mistakes? Have you made simple crochet mistakes?