Damien Darhk screams after his body was disintegrated which is impossible to do without lungs.
Future Sara tells present Sara "Legends never die." Present Nate says: "Really? Goonies?" That quote wasn't from the Goonies, but from Sandlot where in a dream, Babe Ruth tells Benny "Heroes get remembered, but legends never die."
In the scene that takes place in Miami you can clearly see snow falling,