The character's name "Cal Trask" is the same as a main character from John Steinbeck's classic novel "East of Eden," famously portrayed by James Dean in the 1955 film version.
The casino exteriors were from Hollywood Park Casino and Race Track in Inglewood California just southwest of Los Angeles and 3 1/2 miles directly east of Los Angeles International Airport. The race track was demolished and developed into SoFi stadium where the NFL Rams and Chargers currently play. In 2016 The Casino was demolished and rebuilt south of the stadium.
First use by Jane of the "memory palace", a memorization technique he uses often in the series.
Red-haired actress: Andrea Parker.
Cal Trask, played by Gregg Henry was the same name as the character played by James Dean in East of Eden. A similarly in both characters of which who gambled (Gregg in a casino, Dean on the stock market with beans).