What is a staff ghost data?

Answer 1

Staff Ghost Data is when creators of the Mario Kart game have played a particular track. They can be found in the Time Trial section and playing with the Staff Ghost Data for a particular track will mean that a semitransparent version of the staff's race will play while you are racing. The object is to try and beat it (the staff are incredibly fast and hard to beat most of the time) but you will get no reward if you do, it's purely for your own satisfaction.