When Kalkofe mentions the idea of Pellucidar Rütten says that this is more stupid than a "Six-Time Sharknado during a dirndlhunt at Kilimanjaro on Godzilla and Hercules with two heads", recalling other bad movies shown on SchleFaZ
Christine introduces herself as Christine Mutzenbacher, which refers to the character Josephine Mutzenbacher and the actress Christine Schuberth, who played her in the movie