 During the scene in which Superman and Lois go flying together and  then Superman flies away, there is no cut between Superman flying  away and Clark showing up at Loiss door. This was done using a  prerecorded movie of Superman flying away on a screen with Lois  standing in front of it. Then, as she walks away from the balcony,  so crosses from the screen to the set with her apartment where she  opens to door to reveal the real