Have you ever hired someone, and needed to let 'em go shortly thereafter because it wasn't a fit with the team?

If so: Now that you have hindsight, what -- if anything -- could/should you have recognized during the interview process? (Whether you were manager or colleague.)

(I'm contemplating writing an article collecting advice, but am trying to determine what it might say. So private messages are perfectly fine, because at this point it's simple curiosity.)