Last but definitely not least, this Red Dead Redemption 2 Easter egg references one of Red Dead Redemption's most popular DLCs: Undead Nightmare.
To find the mask, go to the southeastern part of Lemoyne, near Saint Denis. There, you'll find a souvenir shop with some really cool items.
On the shelf behind the seller you will see a green mask, which looks exactly like the mask from the end of Undead Nightmare expansion.
These were the 11 best Easter eggs in RDR2, and for other Red Dead Redemption 2 guides at GameSkinny, check out the links below: