This episode marks the first time the Legends are called "Legends of Tomorrow" on screen, however, Martin Stein previously called them this in the opening monologue of "Out of Time".
When seeing the Puppets of Tomorrow, Constantine asks "Fraggle Rock is going on here?", referring to the 1983 TV series of the same name.
The U-Pet Bubble Cat Backpack Carrier has been sold since 2013.
The intro to "Custodians of the Chronology" is quite similar to that of Airwolf (1984) (title slate).
The "Puppets of Tomorrow" timeline marks the first appearance of the White Canary suit since Beebo the God of War (2017), and the first appearance of the Steel suit since Here I Go Again (2018).