There are a lot of Easter eggs in Plants vs. Zombies: Garden Warfare, they will be listed here.
It can be found in Driftwood Shores. Near the second garden, there is a sign called "Porous Bob's" with a font that represents the cartoon character SpongeBob SquarePants. The sign even says that the shop sells neck ties, which is one of the clothing items SpongeBob wears.
SlendermanIt can be found in the woods of Zomboss Estate. An update was added to him in the Tactical Taco Party DLC where he got eaten by a Chomper.
MinecraftIn Jewel Junction, a poster with a Minecraft TNT block on it can be found. It is near where the train is.
Also one of the shops near the left side of the junction is called Percy's Crafting Table.
Bugs BunnyIn Sharkbite Shores, a small ticket stand can be found with the words "What's Up Dock?" on it.
Legend of Zelda: Wind Waker
In Driftwood Shores, at the Marina base, the large red ship has the words 'King of the Red Dandelions' on the side of it as in 'King of the Red Lions' from the game. There is also a silhouette of Outset Island in the ocean if you look closely behind the boat.