Continuity mistake: After Frodo wakes up in Minis Tirith, Merry and Pippin stand in the doorway. Their height reaches the middle of the ornate carving on the door in the close-up, but in their next wide shot running in, they are much shorter. When Legolas and Aragorn walk in, also in a close-up, their height is just a bit higher on that ornate carving than the two Hobbits' heights were. Then when Sam stands in the doorway his height also reaches the center of the carving.
Picture added by Super Grover
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