During the interview, the FBI agents ask Berkowitz to help profile the BTK Killer, but it’s not actually known if the agents ever asked the real Berkowitz for any assistance with the Kansas serial killer in real life.
But while the show got the appearance down, there is one aspect of the Son of Sam interview scene that is the stuff of fiction.
Son of Sam is portrayed by Oliver Cooper in the second season of Mindhunter, who looks strikingly similar to Berkowitz, to the point where it’s hard to tell the two apart.
Douglas did spend hours interviewing Berkowitz while the serial killer was in prison, and even got him to admit that the whole “dog made me do it” defense was nothing more than a hoax.