Quoted from WaddleJrJr:I believe that "255 hits to multiball" bug is one that requires someone to hit the drop target 255 times in order to open up and allow them to start their multiball, so it locks them out of multiball for all that time. It also has issues where a jackpot can register but no points are actually awarded, this bug even happened on camera at PAPA.
It's an underflow bug, instead of 0 left it wraps around, but once it's in the 255 state you can't even get it to go down again, you're permanently locked out of multiball.
With the other bug, you can end up losing a multiball and having three balls in single ball play again because of no fault of your own.
Something crazy like that. The right combination of doctors, playfield multipliers, and you can just rack up billions of points. Granted, you don't usually need that many, and it's still not as easy as sonic booms all day