Metal Gear Solid 4: Guns of the Patriots

Metal Gear Solid 4: Guns of the Patriots Easter eggs

Metal Gear Solid series references
At the very beginning of Act 1 when Sunny's cooking eggs, she says "Only two eggs? Solidus must've taken the day off."

Look at the two puppets dangling from Screaming Mantis. The two puppets appear to be Psycho Mantis and The Sorrow from previous Metal Gear Solid games.

When Snake and Naomi talk about war changing and how it used to be "just a game", all of the Metal Gear Solid titles appear in an indexed list. After MGS4, there are a few boxes titled "In Production."

When you first enter Big Mama's hideout and the guards start talking about Snake, press L1 to see posters from Metal Gear Solid, Metal Gear Solid 2, Metal Gear Solid 3, and Metal Gear Solid: Portable Ops.

In the Nomad briefing missions, take control of the Mk II, and go to the right of the helicopter. There are three separately caged chickens, each with its own label: "Solid", "Liquid", and "Solidus". This is a reference to the three Big Boss clones.

The rubber duck in the upper gantry of the Nomad can also be found in Capture The Flag mode in Metal Gear Online; in the GA-KO camouflage in Metal Gear Solid 3; and floating in the flooded Shell Core in Metal Gear Solid 2.

Otacon has a model of Rex beside his computer.