The main level data loading routine.
$05DAE5 is which level has the variable exits that changes depending on coins, timer, and yoshi coins. To disable the variable properties of this level, change $05DAE6 to 80.
$05DA19 is the start of the code for checking whether or not the level should use a No-Yoshi intro. Change to [4C D7 DA] to disable all No-Yoshi intros, including those for ghost houses and castles.