anya: how were you holding the bar? I hold it via like a clean. But to do that, you'll need to "stretch" your wrists a bit.
The reason I hold the bar this way, is that it allows me to go heavier in weight. Even if you're holding the bar with cross arms as it lays across your shoulders takes some getting use to.
Vince Gironda had a particular way of performing squats, since he believed that they (squats), made the butt larger. And the way he recommmended them performed would rectify this "issue". Not sure if it ever really worked.