When Paula goes to the police to report the AAA, she cannot provide David's last name. Right in the previous scene with Hein at the library, he mentions that "she should stop investigating the death of her friend, David Rolof".
When Paula and Gretchen see the corpse in the anatomy hall move, Gretchen suddenly disappears.
When Paula finds blood in her bed, she touches the sheets and her hands are covered in blood. But when she wants to check out the symbol on the candle put below her bed in the notebook, no blood can be seen on her hands.
Ischemic myocardiopathy is not a rare disease. In fact, is one of the most frequent heart diseases.
Set in the medical faculty, the building has signs reading "Fakultät der Informatik" (Faculty of Computer Sciences) at Technische Universität München.
When Paula sees Gretchen's body, she pushes down a cupboard. In the left corner a hand of a crewmember can be seen.