You start with multiple typos in a single sentence, like this from Yahoo! Shine:
Then you take a recipe from another source (like the popular Web site Cravings) and neglect to give it credit. In the process of “borrowing” the recipe, you mistake 3 pounds of lobster with 3-pound lobsters. And finally, you fail to “borrow” the entire instructions. As bad as those errors are, nothing infuriates an editor more than unattributed text.