From part one[1] (which I'd recommend reading):
> Sometimes it will miss a number, as these phones aren’t 100% accurate, and there’s no way to know what you dialed, because there’s no screen. I know, how did we even manage to stay alive back then? If you botch a number, you’ll have to hang up and redial.
Does anyone remember this with rotary phones? I was pretty young when they were still in use, but I don't remember this being an issue.