I looked at the page you link to, but cannot see any JS errors.
I do see two 404 errors for a png anda gif file, but these won't be affecting much.
I'm not too sure what you mean here, but the lack of errors are probably down to the fact that clicking on "SOCIAL REGISTER" inserts the missing elements (email and usernameLoading) into the page.
I'm not sure what you mean by eject and why you would want to remove this code.
The best advice I can give you now is to try and make a page where we can reproduce the error without having to click on this, do that, go back to the previous page etc.
I appreciate the fact that this must be frustrating, but it is the only way we are going to be able to bring this forward.