Cálculo Mortal

James Remar's character is obsessed with the memory of September 11, 2001. In reality, Remar was in New York City in early September, riding the Ladder Company 3 truck with friend Patrick Brown. He left the company to film scenes for Dæmonicus (2001). As Ladder Company 3 suffered some of 9/11's heaviest casualties, including Brown, Remar says The X-Files saved his life.

When Tillie is run off the road by another cyclist, Niko asks if her leg is okay. He does not ask about the front left side of her head which was bleeding after she fell, but now is no longer bleeding.