compiling some rather huge scripts which are not splitted into separate methods in 2.0-beta-2 fails with
java.lang.ClassFormatError: Invalid method Code length 103011 in class file script13317411350371015768459
None of the scripts failed in other versions (the last one being used was 1.8.0-rc3).
I understand this is originally a jvm limitation and there's a bug from 1999 at http://bugs.sun.com/view_bug.do?bug_id=4262078 but still think you might want to look at this issue.
Unfortunately I can't provide a testcase as those scripts run integrated into a webapp, but I'm sure it's easily reproducable (most scripts run fine, only the bigesst fail).