Jungle Book Easter Egg in Red Dead Redemption 2
While looking at the Red Dead Redemption 2 map, players should travel near the "O" of Lemoyne and look for a specific tree (pictured above). At this tree, they will find Kaa the snake from Jungle Book hanging from it. It's unclear what happens if players try to attack the snake, though.
Bonnie MacFarlane Easter Egg in Red Dead Redemption 2
Fans who played the first Red Dead Redemption game will remember one of the most prominent side characters, Bonnie MacFarlane. In Red Dead Redemption 2, players can discover another piece of information about her: she was previously married, and her ex-husband can be found south of Flatneck Station. A letter can be found on his person detailing all of his regrets and hopes for their marriage. It's probably one of the more sad Easter eggs in the entire game.
Pilot Easter Egg in Red Dead Redemption 2
A nice little reference to the flying machine that John Marston helps build in the first Red Dead Redemption, players can find a similar machine with a dead pilot inside. This is located north of the Big Valley location.
Overtime Controversy Easter Egg in Red Dead Redemption 2
Right before the release of Red Dead Redemption 2, Rockstar faced some controversy over claims that the studio had employees working 100-hour weeks on the game. Some clever gamers discovered what is potentially a reference to this in the description of the Cattleman's Revolver weapon (which can be viewed at any gun shop in the game). Part of the description reads: "It is made by skilled laborers who work tireless hours each week and on the weekends for little pay in order to bring you the finest revolver in the field today." Whether or not this is intended by Rockstar or slipped in under the radar by a bitter employee is unclear, but it's a little suspicious considering the aforementioned controversy.
The Strange Man Easter Egg in Red Dead Redemption 2
This Easter egg is another nod to the first Red Dead Redemption, and includes reference to the Strange Man, who would give John Marston several quests that seemingly test how good of a man he is. He's also immortal and there's a lot of theories about his origin, including that he could be God, the Devil or some kind of demon. In Red Dead Redemption 2, players can find a cabin with an unfinished painting in Bayall Edge. As progress in the game is made, the painting becomes more clear, revealing the Strange Man. There's also a mirror where the Strange Man appears behind Arthur (though he's not there when players turn around).
Agnes Dowd Easter Egg in Red Dead Redemption 2
In Bluewater Marsh, players can find the ghost of Agnes Dowd. Players must go to the area between 3 PM and 9 PM to find Agnes, and she can actually be discovered a total of 16 times, each time revealing a new clue about her haunting life or a new piece of dialogue (though she'll be gone forever after the 16th time). Don't get too close to her, though, or she'll disappear. Funnily enough, Reverend Swanson will warn the gang members about this ghost, which the rest of the group dismisses as nonsense.
Red Dead Redemption 2 is certainly packed with Easter eggs, from the aforementioned UFOs to ghost trains, to a creepy group of people of people called the Night Folk. Really, Rockstar Games has outdone themselves this time around and their attention to detail and callbacks to previous games is admirable. However, surely Red Dead Online will be filled with even more Easter eggs to find when it finally releases at the end of November.