Barry runs past the sign for Coast City on his way to get pizza in episode 1x19 "Who Is Harrison Wells?".
Sara and Alex say goodbye before heading off and then everyone gets married in episode 3x08 "Crisis on Earth-X, Part 4".
Estevez talks to Lydia Spring in dog form while drinking in the park in episode 1x06 "Fix Everything".
Tru and Nick Kelly once again walk through the park in episode 1x02 "Putting Out Fires".