I know GL left the Stormtrooper bumping his head on the doorframe in ANH because its not only a funny scene but a highly cherished one by all SW fans.

But in ANH, after GL turned Jabba from a man into a slug, why did he not change the dialogue? when Han Solo calls Jabba 'a Wonderful HUMAN BEING'

GL is normally so meticulous with what goes on in his Universe, i was thinking there must be a reason, he has had 28 years to correct it but hasn't!
Any ideas?