At the homeless encampment, on the street in the background is a moving truck. The name on the truck is "Great Escape Van Lines". David McCallum played Ashley-Pitt "Dispersal" in the 1963 film, who removed debris from the clandestine tunnels under the Nazi prison camp.
When Palmer enters Ducky's house, he greets Ducky's corgi whose name is "Solo". David McCallum played Illya Kuryakin in the 1960s spy show where he was partnered with Robert Vaughn who played Napoleon Solo.