Chikhai Bardo

In (pre-severance) flashbacks, Gemma and Mark are shown visiting the Butzemann Fertility Center. Butzemann means "bogeyman" in German. Also, the man who attends to Gemma (in the various subterranean rooms at Lumon) is called Dr. Mauer at one point. Mauer is the German word for "wall" (in the sense of a constructed barrier, such as the notorious Berlin Wall).

When Gemma is getting her blood drawn in the room; it shows a close up of the nurse taping down the needle. It's clearly shown the needle is almost all of the way out of her arm.