During the scene of the "live taping" of Bob Lowe the monkey in the background was the same monkey from Batman & Robin (1997) in the scene with Poison Ivy in her lair.
When Lt. Pierce confronts and tries to help Lucifer at his club, he looks and is standing very similar to the way Tom Welling looked in Smallville (2001). He even has a similar looking jacket on as he did in Smallville.
When Lucifer interrupts the taping of the show, one of the puppets says, "Mind your own business Doctor Who!" Tom Ellis previously appeared on Doctor Who (2005) as Thomas Milligan in Last of the Time Lords (2007).