There are a few common mistakes people make when writing a UX design cover letter. One is not tailoring the cover letter to the specific company or position they are applying for. A generic cover letter that could be sent to any company is not going to make a good impression and is likely to be quickly passed over. Another mistake is not including enough relevant information. A cover letter is an opportunity to sell yourself and your skills to a potential employer, so you want to make sure to include information that will show them why you would be a good fit for the position. Finally, people sometimes make the mistake of being too brief or too long-winded in their cover letter. You want to strike a balance between providing enough information to be persuasive without going on for so long that the reader loses interest.