he posed a problem because 1. Han solo walked around jabba and it would have been impossible because of the tail...so george had the idea "well, why don't you have him step on his tail." and 2. because once he got around to RotJ he wanted to add the jabba scene. it was necessary to add the scene and edit Jabba in to the man's place.
"Don't be so proud of this technological terror you've constructed, Admiral. The ability to destroy a planet is insignificant next to the power of the force."-Vader
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