It's tough to tell without being biased of course, but I felt like Houston was very handsy in their defense and typically wasn't called for it (most of their fouls came at the rim or on blocking fouls with the body). For instance, it felt like as soon as MM touched the ball, his defender at least one hand on him, if not two.
On the other side, I feel like this Iowa State defense, compared to the previous couple years, is better at defending without fouling (regardless of whether the fouls get called or not). Fewer hand checks, fewer swipes at the ball, and more defense that's just quick feet. Maybe that'll change as we face better offenses, but at least tonight that's how it felt. The first two Otz years it felt like we were the ones getting away with a foul every possession and daring the refs to call it.