The group was supposed to leave from Westbahnhof, but Bahnhof Lichtenberg is shown, because there is no Westbahnhof in Berlin. There is indeed an Ostbahnhof, but the only station where the group could leave in different directions would be Hauptbahnhof. It seems they couldn't shoot the scene at another station, and Westbahnhof was easier to pronounce than Lichtenberg.