Minor Horse bug on 2k1.
 

If you put two horses together, so that you hop off of one directly onto the other. The horse that you hopped off of will become the same color as the horse you jumped onto....

It doesn't effect gameplay or anything, but it is strange and not ment to be.

Oh, why didn't you say so? That's a horse of a different color!
*badum-ching*
Sorry, couldn't resist.

there is also a little onwall problem with horses. Just happens when you run real fast into a 1 wall tile.. like against a fence you go through it