I'm not exactly sure what the magic school bus is, but I'm very sure Rive should not supervise children! Even though she probably did and the school bus isn't magic, but is just a tardis with a working chameleon circuit!
Did you know that in Doctor Who, the Doctor's bow tie is red if the episode takes place in the future, and blue if it is in the past? (It’s true for the tenth Doctor too. His suit was blue if they went forward in time and brown if backwards) MIND BLOWN