A wall in the Prism headquarters painted with a pattern Carl recognizes, which makes Rend chuckle menacingly.
When Carl gives Rend a shove through the front door of the Prism Kingdom castle, the beach ball rolls across the stone floor, bounces a few times, and comes to rest against a wall with a familiar pattern painted upon it.
The tummy acher looks up at the painting and lets out a low, menacing chuckle. Carl notes the familiarity without explanation, and nobody comes out to greet them—the pattern and Rend's reaction are the only hint that this bare little castle holds something more than an undefended empress.
A stone interior wall bearing a painted pattern Carl finds familiar.
An unexplained detail inside the enemy headquarters that visibly interests Carl's pet.