After the Moira Queen trial, you can overhear a news anchor on Felicity's computer say that S.T.A.R Labs' particle accelerator will be turned on. on time. This is how Barry Allen, The Flash, gets his powers in The Flash (1990).
Moira Queen's defense attorney, Jean Loring, is named after Ray (The Atom) Palmer's fiancee, who is also a lawyer in the DC comic, The Atom.
The Count used a S.T.A.R Labs satellite to broadcast.
Michael Eklund played Gregory Rasputin on DC's legends of tomorrow
Present day portions of this episode take place six months after the Undertaking; given that a date of October 9 is stated to be five approximately five months after the Undertaking within the episode, this is early November.