The following issue arose when I played my friend over the weekend:
The "Return of the Jedi" objective card states "Play after you win a battle in Darth Vader's or Emperor Palpatine's system." My friend had initiated combat against the Emperor, but after a few rounds the battle wasn't going well and I retreated. That counts as a "win" for the rebels, so my friend played the objective card.
However, since Palpatine had retreated, he was no longer in the same system as where the battle was won. Does this mean that the card cannot be played? Or did the win effectively happen as Palpatine retreated, so that the systems overlap? Thematically, it seems to me like the card was valid, but I can see the arguments either way.