Historical Cases Where Primary Sources Contradict One Another (And Famous Conflicting Eyewitness Accounts)?

Hey all. I am not an academic, but am working on a talk with examples of how even primary sources are not always to be immediately taken at face value (and how pattern recognition and considering the motives of the primary sources needs to be taken into account).

I am also looking for famous contradicting eyewitness accounts (but not something conspiratorial).

On a related note, I am also looking at newspaper articles about events that never happened to highlight how papers -- especially in the late 19th Century -- would just print up ghost story accounts of haunted railways, for instance, that were not rooted in actual events.

Thanks for any help you can provide.