Crown means they bought the limited edition of the game and are VIP's. The badge means they belong to a car club. Badge with a line through at the top means they created the car club.
The red bars just mean they achieved a certain feat on that particular tack/car etc. One red bars usually means they travelled about 10 miles on that track. 2 red bars mean 50 miles and 3 red bars is a 100 miles (i think, the mileage might be slightly different but you get the jist lol)