Big Blue Box Crate
Any time after you witness Reaver’s cruelty outside of his main factory you’ll have access to it’s entrance. Directly to the left as you enter is a pile of boxes with a small opening around the side. Head around to the back of it and you’ll find a small crate with the Big Blue Box logo (a development studio) on the sides of it.

The East Hare Egg
There are three statues of men with telescopes in Millfields. Each of these statues has a name: Walter Coen, Jeffrey Coen and Theodore Coen. In the Millfield graveyard, up high on the hill before you reach the lake heading in from Bowerstone, there are three graves with these same names. They tell you when to shoot each statue:

• Walter Coen // Stabbed in broad daylight – This statue is near the Demon Door. At noon, when the sun is high in the sky, smack this statue with your sword. The statue will flash and you’ll hear a scream.
• Jeffrey Coen // Burned at sunrise – This statue at the other end of the bridge that leads to the gazebo. As the sun rises, hit this statue with Fireball. The statue will flash and you’ll hear a scream.
• Theodore Coen // Shot in the dead of night – This one is near the graveyard. Shoot it with a firearm at midnight. The statue will flash and you’ll hear a scream.

After this you should get a prompt to pull the RIGHT TRIGGER at the final statue. Do so and the East Hare Egg will appear in the gazebo. It does nothing, but is a cool, literal Easter Egg.

Zelda Reference
At Mourningwood Cemetery, as you enter the cemetary form the fort, check the left side. In the front row, walk to the final grave stone. It reads “It’s dangerous to go alone. Take this.” Dig here to find a toy sword. this is similar to the beginning of The Legend of Zelda, where the old man gives you your first sword.

Lionhead Logo
After accessing Driftwood via the bridge in in Millfield after (complete the side quest “Restoration” by paying 750 Gold), go to the end of the beach, then turn left to look at the tall structure. If you played Fable 2 you will know this as the Spire. Swim as far as you possibly can towards the Spire and look down into the water and there should be a Lionhead Logo in black at the bottom.

Fable 2 Gargoyle Reference
In Bowerstone Market, go under the main bridge to find a Dive Spot (where you found the Gargoyles Trove in Fable 2). Diving there will reveal a Royal Left Leg Tattoo and you’ll hear a familiar laughter, as if there was a Gargoyle there from Fable 2.

Portal’s Companion Cube
Once you’ve become King/Queen, you get a royal quest where you have to go meet Page down in the old resistance HQ to go track down the local crime lord. Inside his hideout there is a door in a hallway that has a bunch of cells. Around some crates, there is a cell that has a Hobbe worshiping a wooden version of the beloved Constant Companion Cube.