Easter egg: (Blu-ray) On Disk 1, open the "Extras" submenu and highlight "BD-Live". Press the Right arrow/button and a wire-frame of Iron Man will appear below it. Press the Enter button and a brief behind-the-scene vignette between Stan Lee and Robert Downey Jr. will appear.
Easter egg: This Easter Egg is on the first page on the Extras DVD. Go between the Setup and More buttons, and a crown pops up. Click on it to bring up the Easter Egg. It's called Toastie (it's about toasted sandwiches).
Easter egg: On disc 1 of the Special Edition set (the feature movie), on the main menu, the circle with the W and the 214 value (which changes) is a link to a short animation test clip. (I could only get to it on my computer, not my DVD player).