[Answered ]-Somewhere between jQuery and Django, my JSON data gets an extra [] and form validation fails

You’ll want to set jQuery.ajaxSettings.traditional = true; on page load so that jquery doesn’t append the [] to the key.

Source:
http://forum.jquery.com/topic/jquery-post-1-4-1-is-appending-to-vars-when-posting-from-array-within-array#14737000000691277