Let's not pretend that 'experts' are supposed to know everything. If you went for a programming interview and were rejected because you didn't have all of the regex syntax on the tip of your tongue, would you feel the same way? I don't think it indicates a lack of knowledge or laziness. It's just an acknowledgment of the central role that Wikipedia plays in research these days combined with the ease of copy-paste functionality in word processing systems. Had the same thing happened twenty years ago with the Encyclopedia Britannica that might be a different story. But Anderson intended to rework the sections he copied and forgot to. Sloppy work, yes, but it's so easy to see how someone could make this mistake innocently.