Easter egg: Second easter egg on the Region 1 two-disc Special Edition: On the first disc, go to Languages. Place the cursor on "Francais" and press Up once. A red Superman logo will appear next to Brandon Routh's right fist. Place the cursor on this logo and press Enter to access a special cheat code for the "Superman Returns: The Game" video game. Not a traditional easter egg, but an easter egg nonetheless.
Easter egg: Easter Egg on the 2-disc Special Edition Region 1 DVD: Go to Special Features, then Deleted Scenes. Place the cursor on "Features" at the bottom and then press Down once. A red Superman logo will appear below "Features" and "Menu." Now select the red logo and press Enter and you will see some funny outtakes of Kevin Spacey doing his "Wrong." scene.
Answer: The film doesn't take place between II and III, it just carries on from Superman II, ignoring 3 and 4 completely. Think of it as a parallel timeline.
Tailkinker ★