In a recent ranked match I was in I saw 2 bulldozers up at the same time, which should be impossible since there can only be 1 of each character in each team, unless you can equip the bulldozer ability in other characters, which I can't seem to do.
I have read a lot of complaints about the game acting glitchy and in my case has been getting a LOT of error 901 boxes, esp after doing versus races. If you have these same problems, I suggest that you unload the game and then reload it. The error boxes are gone, the game seems to run a lot better. Also, after reloading the game, You will have to do the training missions over again, Which is not really a bad thing..they are totally different than the old training missions and after you complete it, you will be able to log onto whatever account that you were using in the first place. Hopes this helps everyone out