I had been on the 3-movies-at-a-time plan for a while, and then (when money was thin), I trimmed back, even though the amount I was saving wasn't that much. And then when I got my lucrative current gig, I splurged and went to 4 movies at a time. Woohoo, crazy indulgences.
Every now and then, though, my NetFlix Queue shows 5 movies. Wha?! And then, at the top of the queue, there's a link. "Why do you have an extra DVD?" Yes, please. Why do I have an extra DVD? I will click on this link, and I will learn why I have an extra DVD.
Clicking on the link pops up this dialog:

Not really answering my question, guys.