You can run through waist deep water just as fast as on dry land.
A grappling hook punching into steel girders will throw off little bits of wood and masonry.
Saddler's magic tentacles can penetrate deep through re-inforced concrete to come up beneath you, without displacing any concrete, or leaving any signs of their passage. (This really bugged me when facing Saddler as Ada.)
Speaking of that, large structural portions of buildings will not impede enemy attacks in the slightest.
- Exposed plagas whipping through the stairs in the Cabin. - Thrown hatchets moving through the edge of most scenery. - Mendez' second form attacks through the pole etc. upstairs by the ladder with ease. - Besides the aforementioned "tentacle through re-inforced concrete" attacks, Saddler's tentacle whip can move through the door frame in the upstairs room.
Circus acrobats curl up into a ball when doing a quick backflip. Leon and Ada can backflip with their legs and arms extended outwards.