Easter Eggs and Hidden Details in Stalker 2.
Stalker 1 Main Menu
In a small ruined building at the Cooling Tower you can find Stalker 2 (S.T.A.L.K.E.R.: Shadow of Chernobyl) main menu screen. The text on the wall says "She doesn't let go".
Harry Potter Flying Car
In middle of the six islands in right down corner of the map at the Swaps, you can find a car on top of a tree. This car is the one Ron Weasley and Harry Potter have crashed into the Hogwarts Whomping Willow in Harry Potter and the Chamber of Secrets movie.
DayZ Livonia
When entering Post Office in Lesser Zone, the first house in your left has a card on the table with a reference to Livonia of DayZ game.
Sword in Bonfire
Down the Burnt Forest is a helicopter in front of the south dam. Follow the path in front of the helicopter next to water to find a bonfire with a sword in it. It's a reference to Coiled Sword in the Dark Souls game.
Stalker 1 Wallpaper
Your first major town in game is Zalissya, which is located in middle of the Lesser Zone. A little left of Zalissya in the map, you can find this view which is from a wallpaper from Stalker 1.
Sniper Mission in Call of Duty
This sniper in top of a building at the Pripyat looks very much like the One Shot, One Kill mission you do in the Call of Duty 4: Modern Warfare game.