What I mean by this is in certain areas of the game Donkey Kong completely rips you off on how many points you should get. As far as I can tell there are at least 3 different areas where Donkey Kong gives you the royal shaft.
The barrel Stage: When you jump 3 barrels instead of giving you the 800 points that it says on the screen Donkey Kong only gives you 500 points
The Rivet Stage: The game will give you more 300 point smashes for the fireballs, and less 800 point smashes, than it should
The Elevator Stage: When the spring is going down, and you leech points off that, and you are leeching points off the fireball at the same time the game only gives you 100 points instead of the 300 it should give you for leeching two objects at the very same time.
So those are three ways right there were Donkey Kong literally steals points from you.