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Over the back.
Actually it is a push as there is no such thing in the rule book as over the back. I think refs call this way too often just because a player gets a rebound from behind an opponent. For this to be a foul, the opponent has to be pushed out of his legally-aquired position. If that doesn't happen, a foul should not be called.

Blocking foul on a drive to the basket.
I think many refs call a block on the defender simply because he is moving when contact is made. A defender does not have to be stationary in order for a charging foul to be called on the offensive player. If a defender establishes legal guarding position, maintains legal guarding position as he moves with the offensive player, and is not moving toward the offensive player when contact occurs, you only have two possibilities: no foul or charging.