Mark Hamill reprises his role of James Jesse, a.k.a. "The Trickster", from The Flash (1990) to help Barry Allen and the team from S.T.A.R. Labs battle a younger copycat of the Trickster.
Vito D'Ambrosio reprises his role as Tony Bellows from The Flash (1990). While he was a uniformed Central City police officer in the earlier series, he is the Mayor of Central City in this version.
This episode also reunites actors John Wesley Shipp who originally portrayed the Flash as well as Mark Hamill who played the Trickster in the The Flash (1990).
The part of the episode during which The Flash must run in order to keep the bomb on his wrist from detonating is very similar to The Flash's plot line in the animated feature Justice League: Doom (2012).