I was researching an article about Hot Tuna and noticed an error on their site (it's obvious that they use Word Press). I wanted to alert them by sending a message, but they have no e-mail address, contact form, and their comments section is closed. It's such an easy error to fix too (I could make the error disappear in literally 20 seconds).
Anyways, the lesson here is that you always need to keep an eye on your web site, since errors show up all the time. You can see the error in the image below.