One of the key things here is hidden, and another key thing is in-joke (or, more accurately, something the relevance of which is known only to the creator and a small number of other people). The Paramite Pie reference could arguably meet the first requirement, since there's presumably only one place in the game it's said, and the chances of hearing it... by chance... are slim. However, it's not an in-joke, it's a continuity reference than anyone familiar with Oddworld would get. Same applies to the hint flies and SoulStorm Brew bottles in MO, except they're not even hidden.
Now I took the topic of this thread to be inclusive of these continuity references. It is not inclusive of "Elum is Mule backwards," which is all I was really reacting to.
The face in AE is a brilliant Easter egg. No one here has been able to determine its real significance to the artist of that background, and it's so well hidden that it was only discovered a decade after the game's release.
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