Admin style.css differences
It would be good if you could keep your three admin themes in synch with each other except for things like color differences. I noticed this because I always use Minerva on my dev sites so I can quickly distinguish it from the live site. I am creating new admin pages and I had to set the theme on my dev site to default because of changes I had to make not related to colors and there were too many style sheet differences.
I opened a bug report for this one. I think there was some miscommunication a couple months ago when I brought it up to the developers. I’ve asked someone to reveiw the main admin theme and make sure that any new style elements are also incorporated into the other 2 themes.