Superman flies in and out of the theater in his visit with Madame Constantine, but there is apparent opening for him to fly in and out of the building.
The closing credits list Robert Shayne as Inspector Henderson, his normal role. Robert Shayne actually appeared as another character named Inspector Launay.
The episode is set in France, however in the first few minutes when Superman visits Anna Constantine, visible is a sign that reads EXIT above the door. If it were truly in France it should have read SORTIE.
When Superman meets Mademoiselle Constantine at the theater in the background above the door it says EXIT. Since they are supposed to be in Paris, it should say SORTIE.