1-2 Warp Zone
On the second level in world one, jump on the platforms that hover upward. Walk across the top of the level and past the exit pipe. Fall into an area with three pipes and the numbers 2, 3, and 4 will appear above them. Each number stands for another world. I suggest taking 4, it'll take you half-way into the game! Have fun in world 2, 3, or 4!
If your coin total is two identical digits (00, 11, 22, 33, 44, 55, 66, 77, 88 or 99), and the time you touch the flag pole ends in that very same digit, you'll get a 1-Up. For example, hit the flag with 44 coins with 104 seconds left to get a prize.
Don't Get Hit
To do this glitch you will need the the Tanooki suit. When you do a level with a boot, transformed in to a statue above the boot to fall in the boot and don't get hit don't get hit by anything.