I've got a few.
Kicking an egg into an item block activates it... probably shouldn't be able to do that.
The fireflower cancelling out the chicken glide thing is still there.
While invincible with a star, the Ztar ownership cannot transfer. Unfortunately, this also applies with Shines and MultiStars. Is there any way we can fix that?
We should really do something about the font/mushroom house problem. Try using the Retro font, and you'll see what I mean. Also, is there any way to set it so that mushroom houses don't trigger bridges and vehicle movement?
In the level editor, the platform layer should default to 1 instead of 3.