Couch vehicle...
	Dead Space reference...
	The Simpsons reference...
	Various Achievements...
	Wolf Mask and Dinosaur Mask...

Play the "Dustbowl" map. Go to the MG36 battle pickup in the northwest area of the map near the water tower to find a couch named "The American Dream". It is actually a drivable vehicle that can hold up to four players.

Play the "High Tension" map and go to the second floor of the shopping mall. One of the stores is named "Ishimura", which is a reference to the "USG Ishimura" mining spaceship in Dead Space.

Play the "High Tension" map and enter the police station. You can find a few pink donut boxes on a folding table in the garage bay. When they are highlighted, press [Spot] to shout "donuts spotted!".

Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock
A Craftsman's Tools (25 points)	Find your weapons in Sovereign Land before instigating combat in the trailer park.
Almost an Expert (25 points)	Reach Expert Level 10 in single-player.
BYOB (25 points)	Use the BBQ to take out the chef in Ep. 7: Glass Houses.
Blue Eagle (50 points)	Complete all single-player episodes on Hardline difficulty.
Bring 'em to Justice (25 points)	Capture all warrants alive in single-player.
Bumpy Ride (20 points)	Complete Ep. 2: Checking Out.
By the Book (20 points)	Do a Non-Lethal takedown on 10 criminals in single-player.
Cape and Ears Not Included (25 points)	Climb a total of 10 meters with the grapple gun in single-player.
Case Closed (25 points)	Complete all single-player episodes on Officer difficulty.
Damn Thing Doesn't Work (25 points)	Disarm 2 alarm boxes in single-player.
Dare Devil (25 points)	Jump the dirt bike into the mansion grounds in Ep. 10: Legacy.
Deal? What Deal? (20 points)	Complete Ep. 3: Gator Bait.
Electric Company (25 points)	Take down 25 enemies with the T62 CEW in multiplayer.
Fast Rope Expert (25 points)	Travel a total of 90 meters with the zipline crossbow in single-player.
From Their Cold, Dead Hands (20 points)	Complete Ep. 8: Sovereign Land.
Good Guys (20 points)	Complete Ep. 4: Case Closed.
Graceful Exit (25 points)	Don't get spotted in the Ep. 5: Gauntlet.
Hollyweird (20 points)	Complete Ep. 7: Glass Houses.
Hollywood Hideaway (25 points)	Find Roark's hidden room in Ep. 7: Glass Houses.
Keep Digging, Detective (20 points)	Complete any case file in single-player.
Knock Knock (25 points)	Blow up the meth lab in Ep. 5: Gauntlet.
Menz in the Hood (50 points)	Kill 25 enemies with a MAC-10 and 25 with a Double-Barrel Shotgun in multiplayer.
Motley Crew (25 points)	Tag all criminals visible from the rooftop in Ep. 1: Back to School.
On the Job (20 points)	Complete the Prologue in single-player.
One Good Cop (25 points)	Reach Expert Level 15 in single-player.
Pressure Applied (20 points)	Complete Ep. 1: Back to School.
Real Action Hero (25 points)	Kill a criminal in Independence Day from mid-air after escaping the penthouse.
Served Cold (20 points)	Complete Ep. 10: Legacy.
Snow Blind (20 points)	Complete Ep. 6: Out of Business.
Social Climber (25 points)	Find the hidden access to the mansion grounds in Ep. 10: Legacy.
Some Damn Fine Fireworks (20 points)	Complete Ep. 9: Independence Day.
Super Cop (25 points)	Complete all single-player episodes on Veteran difficulty.
The Big Score (25 points)	Win 5 Heist and 5 Blood Money matches in multiplayer.
Their Own Medicine (25 points)	Steal a T62 CEW from the back of a police cruiser in Ep. 5: Gauntlet.
True Detective (25 points)	Complete 3 case files in single-player.
Watched, Dawg (20 points)	Identify 10 warrants with the scanner in single-player.
World's Greatest Detective (50 points)	Complete all case files in single-player.
You Probably Have Questions (20 points)	Complete Ep. 5: Gauntlet.
You Tazed Him, Bro! (20 points)	Stun 5 criminals with the T62 CEW in single-player.
You're Getting Good at This (25 points)	Reach Expert Level 5 in single-player.

Save $10 million in the bank to unlock the Dinosaur Mask for criminals or the Wolf Mask for the cops.