I haven't found any evidence, that this is known, but I also never reported something like this, anyway:

There's an exploit in the level A Disturbance In The Force, that allows to win without sacrificing any titan.
The end is triggered by destroying the castle spawner behind the fire barrier. (The fire barrier is shown during the introduction of the level.)

Now only one unit needs to get through the fire barrier and then the castle can be surprisingly easily be crushed with one fully charged meteor. What is possible in normal difficulty with a high level vampire for example - well I used a vampire. The surrounding troops can be dealt with in the same matter and better before passing the barrier.

So far not a big deal, but it is also possible, when quick enough, during the short notification (Something interesting is happening), when the castle gets active as a spawner for the first time and thus becomes visible, and targetable with the meteor spell.

Now maybe this will get fixed, maybe not - I can only write:
The shortly confused evil accepted it's sudden victory with a shrug.

xD