I used lighthouse in a hidden game, after which my opponent used scepter of evolution. The card slots that I could see before he played the scepter were still visible after the scepter was played, even though different cards were drawn.
It seems that whatever flag is being used to show if a card should be shown in a hidden game is not being removed after cards like auxilia et al.
Screenshot visible at http://www.flickr.com/photos/ericherboso/4345972630/ .