Both of those sets have one thing in common; I built them wrong on purpose. The instructions called for the props to be the same way, and that is just plain wrong (it'll cause the sub to pull to one side ) so I "handed" them. But that's not all I do. For example the 7661 Jedi Starfighter;
I don't have it together at the moment (I recently moved ) but the engines I built so they were mirrors left<->right, rather than the left+top <-> right+bottom that the instructions call for. More often than not, it seems that TLG do this to simplify instructions; it allows more "x 2s", so I see it as "correcting".
Am I the only one that does this?