I think the most notable thing was the Leafs played 0 NHL playdriving centres, and the scoresheet showed it.
Certainly the level of opponent has something to do with it, but the wingers mostly looked neutered most of the game, except for the ones that could make stuff happen on their own gumption (Robertson, Knies, and McMann sort of). It looked like there was a more concerted focus to play Berube's North-first way and rely on linemates and structure to move the puck, rather than waiting for your skill guys, but there was a lot of thinking happening, and not as much instinct yet.
I'll echo cw for most of it: the goalies were good! most of the NHLers were ok to good (except Nylander if we're counting him as an NHLer; he was ineffective). None of the lower tier prospects changed anybody's minds -- some solidified that they aren't NHLers, unfortunately. Given the centres rolled out this game, it really showed Minten's value through his absence.
My ballparked D depth outside the NHL rankings so far (excluding Juniors):
LD: Rifai/Kokkonen Mermis Webber
RD: Myers Niemela Mattinen/Villeneuve