The rules for the Targaryen mode are also a bit different with respect to the other houses on the upper playfield.
If you are playing any other house, if you hit all three targets on the upper playfield, and then the left corner shot, you end the mode you are in.
If you are playing Targaryen, if you do this for Targ 1, you end Targ 1. If you then start Targ 2 and go to the upper playfield, you only get points for hitting the upper targets. Doesn't help for completion. If you are in Targ 3 (Drogon), you also don't get to complete the mode like you would for Targ 1 (three targets and then the left corner), BUT the targets on the upper playfield DO count as made shots and damage Drogon. I like this set up.
What I have not checked is, if you don't get the Targaryen Castle on Targ 1 or 2, but then you do it on Targ 3. Not sure if that ends the mode or not. If it does, it is also cool in that you can basically save up that power for Targ 3.