In order to get the unlockables for racing a cup, you must beat that cup with a gold trophy. To get the easter egg cars, all you need to do is go onto the track in single race, find and break the egg, and then quit the race. It's for that reason that I recommend not unlocking the easter egg cars in normal championships. Unlock each easter egg car as soon as possible after unlocking the track that it's on.

Race this cup...	...to unlock...
Rookie Cup 1	Rookie Cup 2, So Refined, Dragon
Rookie Cup 2	EA Rookie Cup, Passing Through, Mandrake
EA Rookie Cup	Pro Cup 1, Sun Burn, Pro Class, Maelstrom
Pro Cup 1	Pro Cup 2, Falls Down, Cataclysm
Pro Cup 2	Pro Cup 3, The Gauntlet, Escargot
Pro Cup 3	EA Pro Cup, Touch and Go, El Diablo
EA Pro Cup	Elite Cup 1, Surf and Turf, Elite Class, Road Kill
Elite Cup 1	Elite Cup 2, Coal Cuts, Jolly Roger
Elite Cup 2	Elite Cup 3, Wild Kingdom, Malice
Elite Cup 3	Elite Cup 4, Over Easy, Direwolf
Elite Cup 4	EA Elite Cup, Outer Limits, Blue Devil
EA Elite Cup	EA Stunt Cup, Grand Champion video
EA Stunt Cup	Circus Minimus

On this track...	...the easter egg unlocks...
True Grits	Revolution
Flip Out	High Roller
Car Go	Sporticus
So Refined	Van Itty
Passing Through	Buck Shot
Sun Burn	Gamecus
Falls Down	Road Trip
The Gauntlet	Vortex
Touch and Go	Redneck Rocket
Surf and Turf	Cobalt
Coal Cuts	Stinger
Wild Kingdom	XXS-TOMCAT
Over Easy	Interceptor
Outer Limits	Thor

Easter Egg Locations
Track	Location
True Grits	Shortcut 5, turn left between the exit of the barn and the ramp.
Flip Out	After the track splits into three pipes, and you launch yourself out of whichever pipe, turn around.
Car Go	Take the normal line as opposed to taking Shortcut 3. Get over to the left, beside the orange crates. At the end of the dock, turn to your left and go behind the last set of crates.
So Refined	Turn around at the start. After the last building on your left, turn into the dirt, and go around behind the building.
Passing Through	Just as you enter the beach section, turn right and go into the water. Go all the way around the large rock formation at this end of the beach area.
Sun Burn	Skip the first shortcut. Drive around the bush, and continue turning right.
Falls Down	In Shortcut 1. It's in a tough to reach spot on the left side of the wall after you go over the waterfall. Turn left just before going over the edge to try it. I recommend going to Outer Limits and unlocking Thor before attempting to get this easter egg. Thor makes this egg much easier to reach.
The Gauntlet	In turn 5, there are some crates towards the inside. Go around the outside of them, and steer into the alcove in the last set.
Touch and Go	As you approach Shortcut 2, brake and go around the left side of the plane instead. Go up the ramp. Go towards the unoptimal shortcut 3. You will jump two small gaps, in between is a small building with a powerup on it. Turn right.
Surf and Turf	After Shortcuts 1 and 2, brake before entering Shortcut 3. Enter Shortcut 3 slowly, and turn left.
Coal Cuts	Go past the entrance to Shortcut 1, and around the left-hander that comes up. Drive under the first three bridges going overhead. Brake and turn right before the fourth.
Wild Kingdom	After turn 3, you will see three bridges going over the straightaway. Hit your brakes and turn left after the second one.
Over Easy	Turn around at the start. After you go through the tunnel to the city, turn right. Turn right at the intersection, then turn left.
Outer Limits	Turn around at the start. After some left-right weaving you will see two large rocks to your right. Ahead is a rock formation that stretches all the way across the track. Slow down under the rock formation and turn right.

Notable Cars
Naturally, in any racing game, there are going to be cars that stand out above the rest. This section is here to note interesting things about various cars. Why it's located here, though, in the unlockables section of the FAQ, is still stumping me. It should really be in the cars section. What the hell was I smoking when I put it here?

1. Thor
   Thor has a huge advantage over the rest of the field. What's that advantage, you ask? Take a look at it on the car select screen. Now look at another car. See anything interesting? No?
   
   I'll tell you then. Notice that with any car except Thor, when they gun their engines on the select screen, they have wheelspin and you see tiresmoke. Thor has no such wheelspin or tiresmoke. All it has is a big f***in' rocket. Its lack of drive wheels is its advantage, albeit in disguise.
   
   Without further delay, here are Thor's advantages:
   
   Thor has instant acceleration. Without a doubt, it is the fastest car off the line at the start of a race. You can usually blast your way up to 3rd with very little problem. With a bit of refinement you'll be able to nab 1st off the bat.
   
   Thor has constant thrust. This means that it has a much better tendency than any other car to move in the direction it's pointing during a turn. It will bounce along the roughest of terrain at its max speed. All the other cars will lose speed while bouncing.
   
   Thor has air mobility. Find a large ramp somewhere, go off it, and then steer normally, without using the stunt button. Notice you'll actually move in that direction. This is Thor's air advantage: the ability to adjust its course while in the air.
   
   Thor will take some getting used to, due to its instant acceleration, but once you learn how to throw it around the track, you'll find that no other car can quite hold a candle to it.
   
   
2. XXS-TOMCAT
   After reading about Thor, you may be wondering: Is there any other car that can compete with Thor?
   
   The answer is, technically, that they all can when used properly. You make up for your lack of acceleration with copious use of the draft and plenty of powerups. But lo and behold, there is another car with the same type of advantage that Thor has.
   
   And it is, of course, XXS-TOMCAT.
   
   It has drive wheels, but oddly enough, no tiresmoke on the selection screen. It loses no speed as it bounces along rough terrain. Its boosters will allow it to perform aerial movement similar to that of Thor. It isn't quite as agile as Thor is in the air, but it makes for a suitable replacement when people start complaining that they can't compete with Thor ;)
   
   XXS-TOMCAT also has its own oddity. It only has three wheels. This, when combined with the shape of its body, allows you to do a few fun things.
   
   You can easily spin people around by ramming one side of their rear bumper.
   
   It is barely affected by the Oil Slick powerup's initial line change, due to the fact that the initial line change of the Oil Slick powerup affects the front end of the car.
   
   Its shape allows you to 'wrap' it around curved walls, to get a better line through the corner. This is useful on Flip Out when you're trying to stay up on the inside edge of the track so you can get a fast laptime.
   
   It also has the exact same stats as Thor. This isn't useful for much, but it does show that EA at least had the intention of making XXS-TOMCAT able to compete with Thor.
   
   
3. Interceptor
   What about Interceptor? Its stats are nearly perfect!
   
   Too bad it has drive wheels and therefore suffers from lack of handling once you lose grip. If you can keep the tires glued to the road, you'll do well. Its front end is also light enough that it will pop a wheelie at the beginning of the race.
   
   It appears that EA failed to take Thor and XXS-TOMCAT's rockets into account when they made the handling ratings, and brings the validity of all of their ratings into question.
   
   
4. Vortex
   Now you're thinking... Hey, all vehicles have crap for handling except for Thor and XXS-TOMCAT! That's not right!
   
   You're wrong. And I was too, up until a few days ago. What happened? Through a freak chance, I decided to drive some other cars besides Thor. One of them happened to be Vortex.
   
   Vortex has great steering response and slides very little in the corners. This makes it a prime choice for those of you who are fed up with the lack of handling with pretty much all the other cars. Take it for a spin, even if you've already tamed Thor, and compare it to the other vehicles to see for yourself just how well it handles.
   
   This is coming from someone who uses Thor pretty much exclusively, so when I'm impressed about a car's handling, it's got to be good.