When Superman is flying in space, his cape is flapping around just like when he flies on earth. But since there is no air in space, there is also no wind to make his cape flap around.
Superman says that The Planets symphony by Gustav Holst was about nine planets. It only had sections for seven planets, Earth was excluded and Pluto (still classed as a planet at the time the episode was filmed) had not yet been discovered when Holst composed the symphony.
Lois says that she takes assignments all over the world. But in the 4 years the series takes place the only assignment she took outside of Metropolis was in season 1 when she and Clark went to Smallville for a story.