Oh, cute. I think I saw those tracks when investigating the lot myself, but I forgot about it.

I do love the tiny little half-hidden details like that, like the jokes in descriptions, little fun things in some sims' homes, etc. I understand the scarecrow can actually scare your sims, for example, but I've never seen it happen in my game, only in others' pictures (could be because my SO doesn't like the scarecrow, and absolutely hates the pictures of it moving, so he doesn't like me using it much - he's gonna be mad at me for sharing that with you, too :D).