The first error is on page landing, it comes up with:
TypeError: Attempt to use a non-function object or a value as a function
When I tried to debug this error, Konqueror gave me problems (like it was in an infinite loop of some kind. I'm unsure if this is related to DDG or the fact that I'm running a beta) so I didn't do it.
The same error appears thrice more:
Once right after the first time.
Twice after I searched for something (in this case, my test search was "World Cup 2010").
Whenever I try to click on any link from within DDG, it doesn't work (there's no redirect, or however you want to term it). However, if I right-click and open it in a new tab, it works. After those initial errors, there aren't any more JS-related errors that the debugger detects immediately.