When Titus greeted Kimmy as Kim Blake Nelson, this was a nod at the fact that actor/director Tim Blake Nelson made several guest appearances in season 1 as Kimmy's stepfather, Randy.
Most of "Bobby" Durst's ramblings are taken directly from the real-life Robert Durst's so-called "bathroom confession." Durst, the millionaire/alleged murderer, was being interviewed for a documentary about the crimes he's accused of, when he went to the bathroom and was caught on a hot body mic admitting - albeit somewhat incoherently - to killing as many as three people.
Lillians old flame is called Robert Durst - a clear reference to the murderer the documentary "The Jinx" is about