Actual book blooper:
Frodo and Sam are in a chasm so narrow and deep that though it is daylight, they can see a star in the sky. I think this is a misconception of Tolkien's based on the old wive's tale that you could see the stars in the day sky if you were in a deep enough well.
(I know it's not a funny imaginary blooper, but that's what came to mind.)
Imaginary Blooper:
Aragorn grasps the hilt shard of Narsil. "If by life or by... ungh. if by life or by death... ungh. ungh. UNGH. Pfooey! OK! Who put the glue in my scabbard?"
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