The Fringe team investigates a bombing of a train station in which no explosives were found in episode #203 "Fracture".
Kate works at her family's firm at in pilot episode. From episode 1x04 "Bo Me Once". From episode 1x10 "Bridges".
Maddie heads in to interview at the bank where her new target works in episode 1x01 "My So-Called Wife". Maddie interviews for and starts her new job with her mark Gary Heller in episode 1x02 "My Balls, Dickhead". Max calls the Doctor with a status update while watching Heller leave work in episode 1x03 "We Wanted Every Lie". Appears in 3 more episodes.
Count Llaf visits Arthur Poe while in disguise to convince the baker to leave the Baudelaire orphans with him in episode 1x02 "The Bad Beginning: Part Two".