Ghost Question

Well you actually cannot tell the difference, but, when I wanted to see them I created a new license that I have not done any time trials on, then see if they were the same or not. About Yoshi Falls, I personally found this one very difficult, but I then watched the world record and I ended up clocking 1:08(faster than the expert staff.) The trick is to stay as close to edge as possible, start of by using your mushroom right before hitting the first part of the waterfall and go right on the edge of the waterfall, then drift back upto the normal track right before the second waterfall, after this the third one is the trickiest part, if using a bike(which I recomend you do) start drifting and hit the corner of the zoom pad and go towards the water, keep drifting, half way through the the fall you should get the boost use it and mono, then hit the zoom pad after the water and cut back onto the inside track then mono onto the normal track before running into the fence, repeat this three times and you should get atleast 1:10(look at the world record for more help), as for Ghost Valley be sure to talk the shortcut(go straight after the second turn and jump off the slight ramp, but be sure to drift as soon as landing or else you'll probabley be sent flying of the edge.

Those "impossible" ghost just take lots of practice, and a regular nintendo ghost will have a normal nick or actual name.