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Bonus Feature:
On Disc 5, within the "Mortos der Soulstealer" episode, if you watch the beginning sequence and pause right after the scene with Dib in it and when the tube is about to suck the screen, you will see a picture of a Bloody Gir! Jhonen Vasquez wanted to put a Bloody Gir on the show when it was on TV, but since Nickelodeon wouldn't let him do that, he decided to hide the image away on the DVD. This is the only one that I have found, but I've heard rumors that there are more very well hidden ones. Look and see for yourself!
Reported by: Invader Tez