Oh, there's plenty. The old Flash easter egg games barely run, though they're getting better. Lots of SWF4-era actionscript in there, and I don't quite remember all the nuances of movieclip paths. Rendering bugs are described on the Rendering page. You're welcome to feed the bug tracker over on the SourceForge project page..
On the other hand, it's pretty surprising that it works at all. :)
These are listed roughly in the order I hope to fix them:
Add actionscript extension API - done
Wide lines aren't rendered
Built-in actionscript functions aren't Function objects
Need more support for masks: movie clips as masks, masked buttons, etc.
Missing editable text fields
Add missing SWF 5 action objects (Date, Mouse, etc.)
Add sound support
Add missing SWF 5 action objects (XML, XMLSocket)
All fonts must be defined in the file (can't use _sans, etc.)
Add missing SWF 6 action objects
Add dynamically-loaded actionscript extensions
Add HTML support for text fields
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