Playing Field: GTM + UA + Form Listener

Look for inclusion of Google Tag Manager (gtm.js), and from there, inclusion of Universal Analytics (analytics.js)

You should see a "collect" call to send a "page view" to Universal Analytics.

When submitting the form, expect another "collect" to send an event to Universal Analytics.

There's also a "input field change listener" on that page, so whenever a change event is registered on a field, its value is sent as an event to Universal Analytics. Note that doing this on an email field wouldn't be advisable as you are not allowed to send any PII to Google.