When the hostages introduce themselves one girl is called "Britta Mauer". App. one minute later you can see all their passports while they've got analyzed by the team. Their you can see that Brittas family name is spelled wrongly. You can see that it is written "Maeur" which is wrong - because the German word for "wall" is "Mauer" and because she is also from Berlin where the famous "Berliner Mauer" was built in the 50's it is clearly a reminiscence to it.