Singin' in the Rain/Awesome


 * Donald O'Connor running up and backflipping off the walls at the end of "Make 'Em Laugh".
 * Some of the other song & dance numbers, like "Moses Supposes" or "Good Morning", considering how intricate they are and how few cuts are used.
 * Moses Supposes is two takes.
 * What happens at the end, when Lina.
 * Near the end of the "Broadway Melody" sequence, we see Gene's character sulking after being regected by his crush, again. Suddenly we hear a voice sing the exact same thing he did at the begining. Then the two look at each other for a moment, the hoofer just shrugs and walks off. But Don's character has an epiphany and sings.
 * Gene Kelly did the iconic title number with a 100+ degree fever. He also measured each puddle to make sure that the kicks felt right.