Below are two interesting Easter Eggs for Gears Of War 3.

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How to Get the Cluckshot (Chicken Gun)
The Cluckshot is a special weapon that can be acquired in Act 4. There are a few easy steps to get this, but it can only be grabbed on Insane difficulty either alone or in co-op mode.

1 Start a new game in Act 4 Chapter 1 and avoid all of the Ash people.
2. When you reach the tower, stop by the gated area before talking to Griffin for the first time.
3. Press X where the Chicken with the Pirate Hat is standing.
4. In Act 4 Chapter 2, walk up to the car with ammo on it and watch it fall.
5. In Act 4 Chapter 2, walk up to the ammo crate at the end of some railroad tracks.
6. In Act 4 Chapter 3, walk up to an ammo crate on top of a box and a barrel. Press X and it should fall.

If done correctly, when the last ammo crate falls a chicken should fly up and drop off 4 "Cluckshots" for you.

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Dom's Beard Easter Egg
There's a secret Easter egg that allows everyone to have Dom's beard! It's a bit tricky, but not impossible.

First, a new game must be started on Insane mode. At the beginning of the dream sequence, follow Anya as usual until you get to the battle at the Phoenix estate.
Once there, stick as close to Dom as possible for the duration of the battle. A sign that you're doing it correctly will be Dom saying "Yo!" to you. For the rest of the battle, Dom will be squirming around and dodging in and out of cover. try your best to stay as close to him as possible.
After the dream sequence, wait for the cinematic of the raven crashing. Once Marcus wakes up, he will now be wearing Dom's beard! Every character in the game will have it from this point on. An interesting note to this Easter egg; characters in game will be wearing the beard until you die. Once you reload from a checkpoint, the characters outside of cinematics will lose their beard. Though, once a cinematic happens the characters will have their beards back, this time in their natural hair colour (Anya has a blonde beard, Marcus has a black beard etc).