In the Battlefield series, a running cameo is the appearance of dinosaurs. Battlefield 4 keeps that theme going. In the Shanghai campaign mission, a dinosaur decoration can been seen hanging from the rear view mirror of the car, in the first cutscene.
Battlefield Friends
Battlefield Friends is a series started by Machinima that "follows the antics of four Battlefield players." In the Tashgar campaign mission, you'll reach a point where friendlies let you into the base. Head up the alleyway to find soldier groups. If you stay near them long enough, they'll begin to quote characters from the video series.
Easter Egg Basket
In the Flood Zone map during multiplayer, you'll find some Easter eggs and baskets on the roof and in the sheds, near the middle of the map.
Hidden Conversation
Irish and Pac have a random conversation about fortune cookies and other explicit activities if you don't call the elevator in the Shanghai mission.
Megalodon Easter Egg
A megalodon was rumored to be hidden somewhere on the multiplayer map "Paracel Storm", but players were never able to find it. A easter egg was later added in the "Naval Strike" DLC, where players can summon a megalodon by gathering 10 players around a particular bouy on the "Nansha Strike" map.
Phantom Prospect assignment
Note: You must be a Premium member. Go to the Geo Leaderboards, scroll down, and click the faded skull icon. Enter bumpinthenight as a password.
Plants Vs Zombies
Hidden beside a building near the CN spawn point on the map "Dawnbreaker" is a small statue of the Peashooter from the game Plants Vs Zombies.
Use XP Boosts
Like other Battlefield games, your character levels up with experience. If you want to level up at a faster rate, use XP Boosts. These special items are found in Battle Packs. To use an XP Boost, you need to open up the pause menu with the Start or Options button. From here, you can activate the boost. Boosts can give you 25% to 200% extra XP, so they are well worth it, especially in modes like Conquest or Rush.
A Dinosaur...