That's not an easter egg - that was originally supposed to be in ROTS. I mean, it fits right into that movie and it fits in with the PT in general, so how could it not be a real deleted scene? I think it was supposed to happen right before the trip to Kashyyyk. They were going to have Hayden Christensen in the same scene, too, but he wasn't funky enough to keep up with Yoda. Amazing what those puppeteers can do these days! I think they were going to still put Hayden in somehow, but his movements just didn't fit with Yoda's (and there was no way to change them, once they had been filmed), so they put him in at the end of ROTJ instead, so he could still be with Yoda - - - AND Obi-Wan.