Eddie, this site is not for requests, if you want things to be implemented to the game (like "making dog less dumb" ) you can ask at minecraftforum.net
... and what you ask is not related to the API neither.
This crash comes from particles created by the iron golem.
it has already been reported.
(if you wanna play, just desactivate particles in your options before lunching the map.)
Same thing happens for me on my Linux server with an OSX and Windows client. (1.4.3 Pre-release)
It's not a bug, you ask for a feature, see the forum for that. (I don't want to be rude but you should search for some information about what an API is.)
this is not a bug, see the minecraft forum for requests.