1) On my form and system, if you hit the return button it immediately thinks the form is completed, and sends it. A form should not be sent until the applicant reaches the bottom and clicks on the submit button.

2) for field like phone number or email, applicants should be forced into a standard system to ensure quality assurance of data. For example, I can incorrectly enter my phone number as 703-823-22322 or 72335585 (that's one digit short) and it will accept.

3) forced formatting applies to other fields as well. If we are asking for a dollar figure, you should no be able to enter alphabetic characters.

This is all about quality assurance and data accuracy.