The first is when a giant head of Pompadour begins to emerge from the stage at the end of Act 1. This is a direct echo of the giant head of Jochanaan in Herheim's Osterfestspiele Salome. Thematic connection? I don't see one, but trust me, the image is absolutely the same, except for the absence of a silver platter and the presence of a giant bottle of champagne on the top of her head.
The second is even more blatant. See, Act 2 had also involved the rest of the giant head and, er, chest of Pompadour. In Act 3, we see the lower part, in curtains whose framework and color are taken from Herheim and Scheele's Rosenkavalier in Stuttgart. The only addition is the lady Pompadour's legs.
Gotta say I liked the Herheim/Scheele ones better.