Good start
This is a good start for a series. I've seen other series that bother with a long as intro and explanations, but your flash dives straight into the action, which is a nice change from all those long intros. ;)
I liked the sound effects you used. Of course you had the typical "mario is jumping" sounds, but you also had some other sounds like the water splashing or when the toads where running. This made the flash much more interesting to watch.
However, sometimes there seemed to be some static sounds, shortly before the Toad entered Mario's castle.
The speech bubbles looked more like thought bubbles because of those dots that point to the head of the character speaking. Maybe an arrow pointing would be better here. But overall the bubbles worked quite well. I had enough time to read the text plus the text was easy enough to read. So you've done a good job here.
Now I'm wondering how this story will continue... better watch the second episode right now! :)
{ Review Request Club }