Luke has a vision of Jocelyn while unconscious and later the younger versions of them are seen in a flashback in episode 1x06 "Of Men and Angels".
Valentine attacks the signing of the Accords and attempts to steal the Mortal Cup during a flashback in episode 1x06 "Of Men and Angels".
In a flashback, Valentine leads Luke into a trap where he is attacked by werewolves in episode 1x06 "Of Men and Angels".
In a flashback, Clary treats Luke after he is attacked by the werewolves in episode 1x08 "Bad Blood".
Errinwright talks to Mao about the Martian ship heading to Phoebe Station and what to do about Eros in episode 2x01 "Safe". Jules-Pierre Mao watches a news report on the stealth ship that was linked to his company. He talks with Errinwright over coms after the meeting with Avasarala in episode 2x04 "Godspeed".