When drawing lines, they immediately anti-alias. Every crossover, is like a knife cut, when separating objects. Snap-to points and lines, automatically. Flash makes everything that you create a separate object. Flash has 199 levels of undo.
Movieclip symbol is an animation within an animation.
It has its own timeline, and you can animate things all around it. You place animated samples within the libraries palette. All frames are editable, while you're in the edit mode. Animation paths can have motion guides added to them. Select guide layer, and draw the path you want the animation to take.