In Narrow Sky, when you need to free the three birds, usually you have to fly into the water on the opposite side of the map and chop down the plants then break through the cap. However, it's possible to crash into the cap holding the birds in (the big round grey thing) from the outside in such a way that it will break through the wall, skipping all that other stuff. I don't yet know how hard this is or how much time it saves, but it's definitely way faster than the intended route.

Edit: This might be possible in other parts of the run too, where the devs didn't forget the collision but it's possible to crash into it just far enough to trigger the next section, so keep an eye out for more tricks like this. Later today I'm going to investigate if it's possible to skip the final section with the blue balls and just break the barrier through the wall. (Edit again: I don't think it's possible. The wall seems too thick, but there's still a chance one part of it is thin enough.)