All Foreshadowing and Easter Eggs in Attack on Titan: Season 1

This is me trying to enumerate all foreshadowing attempts and hidden easter eggs in the modern day masterpiece Attack on Titan (Shingeki no Kyojin).

Noticed an Easter egg in vol 1 of the manga : r/attackontitan

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Is there any other Anime or Movie that has the most or better foreshadow then Attack On Titan? : r/attackontitan