Don't go off topic. Keep your brain on the things you are good at.
Say thank you to your interviewer at the end and after by email or send a 'thank you' letter by post.
Don't forget your body language like making eye contact, your posture, not fidgeting and not mumbling.
Be genuine, optimistic, attentive, self-assured, frank and succint.
Advice for Job-hunters:
"While reading your CV, ask (trusted) colleagues to go over it before emailing to a new company. If you spend time on such documents for a long while, your brain can amend the words you are looking at in error."
It may be helpful to have:
Driven, motivated and ambitious
Able to demonstrate problem solving skills
A vibrant individual, who is capable of quick decision-making, with the confidence and drive to make a positive difference to their work environment
Ability to multi-task prioritises work, demonstrate accuracy and pay attention to detail, meet deadlines