When I was in college it was raining heavily outside, and I had to walk from the lab to my dorm at some point in the next hour. I started thinking about the secretary problem and derived the continuous case for it (surprise! It's 1/e) to figure out how long I should observe how heavily it was raining before I trying to head out.

I mention all this because modern hiring is nothing like the actual Secretary Problem, which is about when to stop given unknown information on future samples and a known retry limit. No one hires that way anymore, so I don't feel like the author side-stepped anything about it. I guess that doesn't matter, but it irks me as someone who's spent time on optimal stopping.