Great list! One of my favorite Easter eggs is in Michelangelo’s Sistine chapel. There is a cherub or angel with his thumb behind his forefinger and this in Italian is a curse word or gesture. Apparently it’s an FU to the pope from Michelangelo
Calling these 'Easter Eggs' is not really appropriate. Amor Sciendi's channel can generally be trusted for serious analysis of details that might otherwise be missed by a casual viewer.