Battlefield Play4Free

You got your Battlefield Heroes in my Battlefield 2!

Critical Hit
The "critical hit" sounds from Battlefield Heroes are present in Sound_client.zip\West\Weaponry\Common\Critical\

"Vroom Vroom!"
The emote sounds from Battlefield Heroes are present in Sound_client.zip\VO\English\West\Emotes\ and Sound_client.zip\VO\Russian\West\Emotes\

Placeholder Heroes Artwork
Lots of leftover Battlefield Heroes graphics are present in ''Menu_client.zip\External\FlashMenu\images\. All of those images can or could be found in Battlefield Heroes itself, except the Battlefield Assault logo. These images where probably used for testing around.

Battlefield Assault
Menu_client.zip\External\FlashMenu\images\background\ has, among other things, this old title screen from an earlier version of the game under a different name. Curious.