I agree that on overhead casting, allot of people will drift the rod forward prior to making the forward cast. My cure for this has always been to close my stance. Just like a batter can close his stance. With the closed stance it is easy to look over your shoulder and see what the rod is doing. for those that want to learn to drift the rod farther to the rear for a longer stroke this is an easy way to learn to do it.
But my biggest bug a boo is trying to keep to much line in the air. I have a habit of shooting line on my back cast and sometimes trying to get that extra foot I put to much in the air and everything turns do do. Thats one thing I like about the multi colored lines. When I see the wrong color at the tip I know I am in trouble.