This easter egg is a reference of the Warner Bros movie "The Iron Giant" (1999). It can be spotted in the beginning backgrund of the autumn level. (See pictures)
(Iron Giant easter egg)As seen above there is a strange figure with glowing eyes looking over the trees
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(Iron Giant easter egg) Here is the huge robot from the movie "The Iron Giant". The description of the two pictures are the same, Huge, grey, glowing eyes and in an autumn pine forest
