This morning I posted beta-3 of Google Forms.  This latest beta addresses an issue reported on the Google Forms Support Forum where extra URL parameters would result in the form not being rendered.

Google Forms has supported additional URL parameters for a while as a mechanism to preset form values.  The problem turned out to be that parameters which contained spaces weren’t being handled properly which resulted in a bad URL.  The bad URL was then used to retrieve the Google Form which failed and resulted in the form not displaying.

This build properly handles spaces in URL parameters and Google ignores, as expected, any parameters it doesn’t know what to do with.  So in the case reported on the Support Forum, the extra parameters added by MailChimp will simply be ignored.