Daytona USA

When you drive near the Slot Maching, press: START 3 times. If you get three 7's you'll get 7 seconds of extra time. If you get three Bars you'll get 5 seconds of time.

If you stop on the last corner the seagulls will get closer to your car. If you drive the second lap in reverse the Statue will be standing on it's hands. If you stop completely near the statue you can make it spin by pressing the Start button repeatedly. When the game starts press the start button repeatedly to make the seagulls get larger.
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Hidden Music
Input the following codes:

H.O (to hear music from Hang-On)
V.R. (to hear music from Virtua Racing)
At the High-Score screen.

Please do the following:

On the beginner track there is a slot machine on the top of the stone arch. To play the slot machine, press Start to stop the movement of the wheels. If you get a 777 you'll gain extra time.

In the transmission selection screen hold the "Start" button down, you will notice that it says "Real Players Only". Keep holding the "Start" button down, until the transmission selection time runs out (You have to choose manual.) From my knowledge this only works on the beginner track. Continue holding the start button down through the whole first lap. If you notice you reach 210 mph just before the Jackpot machine. This will give you at least 2 car lengths lead over other racers that don't do the cheat (if you do it right and don't bump any other cars). This will give you time to get away from the rest of the field and keep on truckin'.