I don't believe the general population is forensic savvy. Talk to friends who read True Romance while you read True Crime.

THIS perp has shown through the note that he had a particular interest in action movies. From there, speculation has stretched into presumed knowledge of such long ago crimes as the Franck murder (Leopold and Loeb), the Lindbergh kidnapping, the Clutter family murders, etc.

I'm not so sure he was as savvy as we give him credit for. Was he 'lucky' to

have a crime scene that was contaminated from the start?
have an inept, inexperienced police department?
have the FBI killing time in Denver and at the BPD offices, rather than get set up to handle the 'kidnapping' they were required to handle?
have 'chosen' to commit the crime on a day when the police department (and maybe the FBI) was down to a skeleton staff?
have chosen a family that the public loves to hate?
have committed this crime in a political atmosphere that was not unlike the Hatfields v the McCoys?

TWO people contributed enormous advantage for this perp. How could he have predicted how much they would HELP him get away with this crime? John Eller, whose obstructive behaviors, time and again, created an uncooperative atmosphere between the BPD and other law enforcement agencies and between the victims and law enforcement could never have been predicted. AND Steve Thomas, modeling after his mentor, John Eller, with belligerent, arrogant, obstructive activities that further damaged the investigation and led the BPD down a ridiculously illogical garden path. How lucky could a guy get?