The cantina scene just has a room full of miscellaneous aliens. It serves it's purpose.
Luke and Obi-wan do not pick up an annoying alien and make him a constant companion for the entire film.
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http://img.imgcake.com/AlecTrevylan006/fdshieldpngyn.png Eff_Dee
http://img.imgcake.com/FDjpgyb.jpg