I've written about post-mortem meetings in the past, but this post explores the topic in more depth. It was first published on the TeamGantt blog on September 5, 2017. Check it out--and comment if you have any thoughts on better post-mortem practices.
Also, yeah, I know people prefer different names for this meeting. I chose post-mortem, because that's what I'm used to using. Call it whatever you want--just be sure to learn something useful fro the meeting, but more importantly, act on it.