I noticed a bug while playing this earlier in 2 player mode. Player 1 destroyed 1 castle before losing their ball, I took over as player 2 and destroyed 1 castle then the 'Goal Complete' line popped up. I checked the goal list and the 'Destroy 2 castles' goal was ticked off. I don't know if it's just this goal/table that's got this problem where you can share goals between multiple players.
Hopefully it'll be fixed on the next update (along with the flipper gap!)
Hopefully it'll be fixed on the next update (along with the flipper gap!)