Ping Pong by Konami is a great classic which I discovered first on the MSX of a friend. Like a lot of people, I did play a lot of this game which had sometimes a graphic bug : a part of the ping pong racket and/or the ball stay on screen.
The problem seems to have its origin in an overflow in add a,b instruction at $4fad when calculating the difference in height to be added to the ball and its shadow later at $5003 and $5016. There is a modified disk image by MaV with the correction by 40Crisis. Thanks to them.