Red Dead Redemption Easter Eggs

There are several locations in the game with Easter eggs and such. Some of these are phrases written on walls, which are actually cheat codes. Here are a few examples:
 * In the upper part of the barn on the Marston Ranch in the West side in the loft there is the words Oh My Son My Blessed Son in white paint on the wall, this is the cheat code to change John Marston to Jack Marston.
 * At the cemetery near Armadillo were you meet Seth Briars you will notice the cemetery gate is the same gate used for the cemetery in Grand Theft Auto: San Andreas in Ghost Town.
 * When joining a campfire sometimes the characters will tell a story about a dueling contest that was won by a man named Red - a reference to the first game, Red Dead Revolver.
 * In the destroyed building where you pick up item #3 in Aztec Gold, this is on the inside wall: "I DON'T UNDERSTAND IMNFINITY"
 * In Hendidura Grande, there is writing on the wall saying "Root of all evil, we thank you!"