Ronnie exits the back of the coffee shop and is ambushed by General Eiling's soldiers in episode 1x14 "Fallout".
Barry loses control of his new speed powers after leaving the police station in pilot episode.
Barry waits for the right moment and then swaps himself out with his past self in episode 2x17 "Flash Back".
Barry catches up with Zoom only for Zoom to be killed by his own time double in episode 2x23 "The Race of His Life". Killer Frost freezes Cicada's dagger giving Barry a chance to try and convince him to accept the meta-cure in episode 5x16 "Failure is an Orphan".
Savitar drops the Earth-3 Flash in an alley and prepares to kill him before getting pulled away by the stone in episode 3x09 "The Present".
Source: Mohd Abdulla — Twitter
Ralph Dibny arranges to meet the Mayor to hand the photos back over in episode 4x04 "Elongated Journey Into Night".
Oliver searches for the sniper's bullet in an alley wall in episode 1x03 "Lone Gunmen".