My Review
Honestly this seems, unfortunately like one of those overlook gems on Newgrounds. I don't mean this is a great overlooked series, I mean it's one of those things were you clearly had a good idea and didn't execute it properly. This idea and series could have so much potential, you continue to draw the characters as stick people.
When you introduced Mario, and the cast of the franchise, I was expecting a little effort put into it. Mario was just a stick man with a sideways drawn nose, a mustache, and a line representing a hat. I highly suggest you get skilled enough in the artistic department to at least be able to draw bodies or faces properly if you want more views and fans. Again, this series could be a lot better. I enjoyed "watching" this, but it felt like you didn't put much effort into it at all.
The idea is their, but the passion for the series isn't. The backgrounds were another big problem with this, as it was often quite plain. Some times the next frame would show a picture or an object for some reason switch positions.
The clouds could use some simple tweening which would add at least a lively affect. I suggest adding separate layers for individual things. Such as, text, people, backgrounds, and so on. That will put a stop to people twitching and so on, it will make thins much easier.
Voices would be much needed to make this series whole. If you're not going to do that, at least add some subtle background music so I don't just feel like I'm reading. I know you added the Mario music but that got a bit screwy towards the end.
I can tell you are quite new to flash and animation, so I hope the above advice will help you greatly improve on your skills and make this the great series it should be. Because you definitely have the story telling aspect down.
Good luck,
-psychicpebble