I have a complex dojo app that works correctly uncompiled, but after compiling with Google's Closure Compiler, I get subtle differences in some behaviours.

As it is, it's exceedingly difficult to debug, and I've been unable to find any information about possible functional differences between compiled and uncompiled Javascript with Google Closure.

Can anyone point me in the direction of known differences, or share any similar experiences and some ideas of where to start looking?