Nichols holds a German newspaper in his hands about the killing of a banker. In the headline it says "... Beider Meinhoff" which should be "Baader-Meinhoff". Near the end he shows the same newspaper again and they corrected it.
Christopher Meloni is the father in the photo of the German newspaper when Tania Raymonde: Shelley Smith, Birgit Kaspers was an infant.
Kathryn Erbe has now appeared on the show more times than Vincent D'Onofrio and therefore, anyone else. She did not appear in episodes 3.10 "F.P.S." or 3.11 "Mad Hops" with him. Her appearances in 6.22 "Renewal" and 8.14 "Major Case", tied her with D'Nofrio. By appearing in 8.16 "Revolution" she overtook his number of episodes record.
First of two appearances by Marina Squerciati in a Dick Wolf series before her debut as "Kim Burgess" in Chicago P.D.
Urea is an organic compound that is essential for the survival of animals, it plays an important role in the metabolism of nitrogen based compounds in animals and is found in high levels in urine. As it contains high levels of nitrogen urea's most common industrial use is as a fertilizer.