Syd and her team help David escape where he is being held and they escort him down to the beach where he meets Melanie Bird in episode 1x01 "Chapter 1".
Young David and Amy play with their dog on the beach in episode 1x03 "Chapter 3". Amy and David play in a flashback while Amy tells Dr. Poole that they never had a dog as a child in episode 1x04 "Chapter 4".
Lenny explains how she stole the stove while walking down an alley in episode 1x02 "Chapter 2". Lenny rolls David down the alley in a shopping cart while Syd, Melanie, and Ptonomy walk past. Melanie introduces Syd to child-David and Syd gives him a hug in episode 1x03 "Chapter 3".
David is taken to a facility in the woods where Dr. Bird and the others attempt to help him control his powers and examine his memories in episode 1x02 "Chapter 2". David sits by on the dock while Melanie listens to the coffee machine. Later Syd and David land in the water after teleporting out of the building during a stressful session in episode 1x03 "Chapter 3".