I don't see it as a huge deal. I kind of get the impression that Luke didn't share many of the details of his Jedi training with Han & Chewie anyway, especially given their initial skepticism. Although it could explain why Obi-Wan seems casually familiar with Chewie in the cantina, although Chewie later seems to suggest to Han that Obi-Wan is weird ("Boy, you said it Chewie. Where'd you did up that old fossil!?). Although given we can't understand Chewie, he could've been saying that he served with a similar man in the Clone Wars for all we know and we only have Han's word for that.