I have made it mandatory that user must enter his name before commenting.
But if user clicks on "Anonymous" above the name field and then click the Send button, the comment is submitted - without the mandatory name.

Also

What is the idea of the Cancel button? If think that users will feel uncanny, because after cancelling the form, it still remembers your info.
It ought to work exactly as a usual Clear button - that's clearing everything for good.

And

Probably related to the above, even though I have Cleared the form, attempted to send it as an empty form and reloading the page, for some strange reason, the email field is always prefilled with the letter "i" instead of "Enter your email". The "i" in this case is probably coming from the first letter in a previously entered email adr

Another thing puzzles me: why is the "Cite" button publicly visible, when setting is that only administrators can reply? It is of no use to the public.