Practice like you race because you race like you practice

I have heard variations on the practice like you race idea since I was an age grouper and had always thought I was good at it but I just had a couple of realizations about how I created problems for myself.Lately I had noticed I was having a stall sometimes at the breakout of my BR pullout.I couldn't figure out what was the problem until I realized that one of my favorite sprint sets is 25s with a turn at the end.I would,of course,stop after the pullout and my body was learning to stop there.I'll now do 2 more strokes after each pullout. At the meet yesterday I was shocked to realize that at the finish of my 100 BR I had my head up instead of down in complete streamline.In workout today I noticed I had gotten in the habit of lifting my head to look a the clock as I finished. So how about you,any insights you have noticed about practice and meets?