Continuity mistake: When Denethor holds the Horn of Gondor, the metal loop (with rope), which is affixed at its wide end, is located at the outer curve where it is cloven. However in both FotR and TTT, the metal loop at the Horn's wide end, is located on the inner curve where it is cloven, on the opposite side!! (There are only two metal loops and they are permanently affixed.)
Picture added by Super Grover
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