I don't remember any drops by Ferguson. But he did break off a route, which almost resulted in an interception, and he was not aggressive enough going up for a long pass, which DID result in an interception.
The defense is nothing great. They did get jobbed on a couple calls by the refs, but the Bucs also got jobbed on two pass interference calls: the one against their defender when it was really Donald Driver who interfered, and the flag they picked up when Al Harris interfered with one of their receivers.
Overall, the biggest difference between the Packers and their opponents in recent games is that Packer defenders play with their back to the QB and the opposing defenders are facing the QB and playing the ball.