The Trouble of a Link to Another Website's "Code"

Well, recently I've been really frushtrated because of a website's code. A "Code" is when you put a link or a picture on a website, you have to copy it and paste it on your website, but if one thing goes wrong, (Maybe a few.) the code shows on your website. In my last blog the link to Diaster Day of Crises's code showed up. So, you have any idea how to fix those problems?