They'd probably be delighted to hear that you're reading the book (and it wouldn't hurt to mention that you think it's good!)

You could mention that, and ask about the causality problem, why it seems backwards compared to the earlier description, and how you've not researched it yourself and would appreciate clarification. You can also mention that you've noticed some minor typos and ask whether they'd appreciate them for a future printing. I think it's safe to say authors would rather have mistakes not continue to be reprinted.