I just rewatched the Supernatural ep "Home" and I think I noticed a plot continuity error.
At the end of the ep, Missouri tells John that Sam's powers are very strong, so she's surprised he didn't sense his own father. But in "Salvation" (I think), John finds out about Sam's visions for the first time and is mad that Sam held out on him. So that shouldn't be news to him! Unless he was just mad because Sam never told him, but that's not how that scene played, IIRC.
I love Missouri. I hope she comes back. I love how she keeps sassing Dean.