Lord of the Rings Series -- Amazon

For me, they crossed into "direct contradiction of canon" land when they had Celebrimbor and Elendil alive at the same time. There's another contradiction coming if they insist on the Palantir being lost. They aren't. Elendil knows exactly where the seven for Numenor are and he brings them with him to Middle Earth.

"Seven stars and seven stones and one white tree."
and those are potentially valid criticism to level AT THE END of a story
In Better Call Saul 'some fans' spent every episode of every season with "THIS is when Jimmy becomes Saul" or "why hasn't Jimmy become Saul yet?"
and then of course there was the 'how are there any stakes since we know X, Y and Z live?!?"
and then BCS finished as one of the best shows of all time

by and large, fans (and i include myself on this criticism) do a much better job when they engage in a story vs trying to be culture/lit critics when it suits them