by BlackWidow » Thu Dec 24, 2015 6:02 pm
It's just one of many unfinished/unpolished parts of the game. BB-8 most of the time just wanders around unless he's needed for a specific mission. But yes, you are correct, the characters randomly talk to him. It seems part of their general play banter. I haven't played the characters enough outside of the playset to see if they do the same thing in their regular play banter, or if it's specific to the playset.
But no, you aren't missing anything - this playset is just unfinished.