Easter egg: Under Join the Brotherhood (Magneto's side) Go to Features. Then Deleted Scenes. Press "More" until you find the scene called "Henry Warns About Magneto". Highlight it, then press the left arrow to highlight an "X". Press enter and you will get to watch a short 2005 promo for the movie. Under Take a Stand (X-men side), this feature requires you to highlight "X-men land the chopter" then press the left arrow to highlight a "Magneto Symbol".
Easter egg: At the main menu choose Hibernate. With your DVD remote enter 6 then 9 then 5 and press enter. Two new choices appear, a basic game for kids and a rather funny song with Hammy the Squirrel called Jingle Burps.
Easter egg: 3 easter eggs on German edition (G-41088-ST-FSK): one concept shot of objects, two fully rendered but dumped scenes. Elements of these scenes have been used in the final movie, but at another time and place. 1) go up in the main menu to highlight 2) go up in special features -> activities (Extras > Spiel mit!) 3) go left in the language selection.
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.
Easter egg: On disc 2 of the 2-disc special edition, enter Mastering The Blade. Highlight Return To Bonus. Press left and down. This should highlight the keyhole. Press OK to see a short clip of the dog and its trainer.