Wow, some big flaws in here. This so called 24 Hour Expert Trainer really needs to pick up a copy of Starting Strength.
Point toes forward.
Knees coming in caused by abductors instead of adductors.
You bend forward (GM) because your traps are weak.
Apparently arching your lower back is bad. Well, at least he gets that rounding is bad. I'm guessing he wants a straight back - a completely unnatural position that will put undue stress on your spine.
Your heels lift up because your calves are tight.