Also - while I'm mentioning that - because the input elements of the First Name and Last Name are on the same line as the label elements, there is no space between the label, the colon and the form field when the form is rendered, making it like this:
Email Address: |____________|
(Notice no space after the colons for the first 2 and a space after the last one.)
I know it's a minor detail, but it's especially noticeable when they're on the same line.
I'm sure you have bigger fish to fry than tweaking that minor detail, but if you're concerned about consistency, this would be something to find and fix.
Thanks again so much Mailchimp! You know I love you! :)