Its hard to say as i feel somethings was actually there as clues to the Xeno connection as such the Frescos and Mural......
But i think the Face Hugged Engineers in the Mural, was a Easter Egg, which means maybe my using it as trying to make sense and connection to the Engineers and Xeno could mean i have mislead myself lol
Others are the Nostromo Display as First Child says... and also the Cargo Hold of the Urns on the Juggernaught and parts of the Nostramo...
Yes the Blue Ray extras also some Easter Eggs there too...
But the infogram for chemical Chemical A0-3959X.91 – 15 was their attempt to try and clear up inconsistancies of how the Goo was shown to work in the movie, they did it as a way to maybe try and show us how they intend to show how this stuff works..
Off course the Infogram has more Holes than a Swis Cheese lol ;)