Have you ever seen a faux balcony on a house? Or perhaps some other fake feature that had no functional use whatsoever? This really bugs me. Being a programmer, I am all about functionality. Luckily, our product interface isn't developed by me. If it was, it would likely resemble an emacs editor.
This picture causes strife in my life because I would insist on putting in real doors, not the appearance of doors. I like real. I like functional.
This goes for websites as well. I often come across sites that have a list of services or products that don't link to further information. I also see sites that have images that look like buttons but aren't linked to more information. And of course, the worst is when sites have broken forms, broken links, or broken images.
Now, I understand broken elements aren't planned like the ugly faux door above, but they are a product of the tools used, the individuals level of training using them, and the organizations commitment to the website. These small faux issues cause immediate headaches and frustration with visitors and will likely turn them away.
So be sure to check your website for broken elements and don't try to trick your visitors with the appearance of something that should truly be functional. Your website is not a Hollywood set. It is a direct extension of your voice and your message to potentital and existing customers.
And just for the record, my #1 pet peeve is double doors where one door seems to always be locked. Some even have a sign that says "Please use other door". Can't the people who unlock the doors turn the little key for the second door too? I don't get it.... but of course, I don't unlock doors for a living.