Pet Market Blueprint Application : What would you have done differently?

I have started to really dig through the Pet Market Blueprint application and take the code apart. It really is a great resource on how to build complex client / server applications using Flash.
The article provides a very good overview of how the application was put together:
A Tour of the PetMarket Application
However, the app is not necessarily meant as a showcase of Flash best practices. So, if you have looked through some of the code, what do you think could be improved and / or optimized? Post you thoughts in the comments section.

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