You might check out a recent presentation on SSRN by Bernard Black, "Bloopers: How (Mostly) Smart People Get Causal Inference Wrong." http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1663404
I will say that I also admire David Freedman and appreciate his work. Though I was a UC Berkeley grad student while he was here, he passed away before I had a chance to take his course. You might have a look at his collected works edited by a few other Berkeley professors: "Statistical Models and Causal Inference: A Dialogue with the Social Sciences."
Charlie