Lack of research. Don't walk into an interview without having researched the company and position beforehand.
Generic answers. Avoid vague or overly common answers. Be specific and relate your responses directly to the job description.
Negativity. Never speak negatively about previous employers or colleagues – it leaves a bad impression.
Focusing on salary too early. Wait to bring up salary and benefits until you've demonstrated your value.
Being unprepared for surprises. Be ready to think quickly and respond creatively to unexpected questions.