There are twelve Rockstar Games logos hidden throughout each level in the game. Some locations of the logos are as follows:
Atlanta: When you get out of the garage immediately turn to the right. You will see a glass. Crash through to find the logo.
Atlanta: While looking at the shipping station, turn left and keep going until you find a park-like area. There will be a ramp at a corner of it. Hit the ramp at full speed, and after you land on the building, continue forward and jump over to the next building. You should see an open area to the left. The logo should be located there.
Atlanta: Drive to the bottom of the map. Look for a building with a huge globe. There is a logo that reads "Nitro Cola". A logo is located directly under that.
Atlanta: Drive to the graveyard in the south of the map (near the highway). There is a logo at the east part of the building there.
Atlanta: Follow the building where you garage is located. Drive through the skeleton's mouth and you will find a logo.
Atlanta: Follow the highway until you reach a place with some construction work. Drive off the highway (to your right side if driving north), and look for a tank station. Follow the building around and you will se a ramp/road going up. Get some speed, fly over, and you will land on the roof of building. The logo should be in front of you.
Atlanta: Follow the highway until you se a building with a yellow sign on top that reads "DJ Smalls". Across the road is a small parking area where you can see a sign on another building that reads "Spike". Left of that building is a basketball court and a logo.
Atlanta: On the freeway at the top right-hand side of the map, there is an overpass. There is a logo under the overpass on the right-hand side, if you are traveling north.
Detroit: Look for Comerica Park. Near there is a building with some glass that you can drive through. Inside you will find a Rockstar logo.
Detroit: Look for a building with the Detriot Atrium. Drive through the glass to find another Rockstar logo.
San Diego: Find the aircraft carrier and locate the ramp to jump onto the flight deck. One logo can be found here, on the ramp.
San Diego: Drive to the beach at the top left of the map. Follow the beach until you see a small tunnel. There is a logo in there.
San Diego: There is a logo behind the baseball stadium. Follow the highway to the back of the stadium.. You will then se a small ramp. Drive up to find the logo.
San Diego: There is also a logo at the top deck of the aircraft carrier.
San Diego: At the lower left of the map (near the aircraft carrier), follow the coastline. There is no road near by. Follow the large building, and you will find a little road that leads up to a roof. Turn left and you will see the logo.
San Diego: Almost at the lower right corner at the map, there is a huge parking garage. When you are on the streets, drive to the bottom left corner of the building. Drive up the ramp, turn left, and drive through the windows to find another logo.
San Diego: To the far left of the map at the rollercoaster, drive up the ramp that is located at the north of the rollercoaster. Ride to find the logo.