Has there ever been an instance where there was an obvious continuity error with a character in regards to the storytelling. I'm not not talking about the occasional mistakes in the artwork (for instance occasionally having Rick's amputated arm be the left arm instead of the right) but more in regards to the story and writing.
Has a character ever appeared in Alexandria when they should have been at Hilltop without there ever being an explanation for it (as a lot of the characters do tend to move around a lot between those two locations). Or for instance a character knowing something that they shouldn't have known?
Are there occasional mistakes like that in the book or is Kirkman and the editor pretty good about keeping track of each and every character and making sure they are where they are supposed to be and they know (or don't know) what they should or shouldn't?
With them having around 50 currently active characters it wouldn't be that hard for their to be an occasional slip up.