At times, the characters seem to give up any logical thinking, relying entirely on "feelings". Because Archimedes never existed in Middle Earth, a character believes for instance stones don't float because they don't "look towards the light". Another character believes that someone that literally fell from the sky in a fireball is important simple because "they have a feeling".
I could go on about how many scenes look like stock footage, but now I'm more curious as to how all these details don't affects how some viewers take it all in. I know each example individually seems minor, but the sum of 100 minor absurdities is a huge absurdity.