Nerrrrrrds!

Blunder No. 3: “When Arwen and Frodo are being chased on horseback by the Ringwraiths, the soundtrack to the scene is a cantering horse. A canter is three beats, whereas a gallop—which is what the horses on screen are doing—is four very fast beats that often sound like a single beat.”
Jackson: I should’ve—well, it’s too late to fire anyone. The damage has been done.

Nitpicking the Lord of the Rings