I think its important to find out that only the first 30 minutes of this audio talks about "the psychology of magic". The second 30 minutes describes the author's close-up restaurant routine. The description of the routine is interesting, as it is well thought out, and there are some interesting variations to standard marketed tricks. This was somewhat different to my expectations. I expected about 50 minutes on theory, with maybe a slightly nod to his current routine at the end, by way of illustrating the theory.
On the first 30 minutes, Dr Nagler discusses one very specific aspect the performer-audience relationship. He makes the point that at a fundamental psychological level, people don't like being fooled and this causes resentment and other negative attitudes towards magicians. He then offers four (and a half) strategies that a magician can use to work around this problem. Some of these ideas are found in other books on magical theory, but nevertheless, Dr Nagler does add some interesting ideas to the discussion.