I feel like I answered your question for how not to blow the interview, but I can give you other examples of what blew the interview for people I've interviewed. This was after the HR screening as I was the hiring manager. The folks I interview are normally extremely well-educated with masters or PHDs and about mid-level career. The resumes that make it to me are very impressive. Some of these interviews were so bad I had to diplomatically end them after 20 minutes when an hour was scheduled.
What excites you most about this job? Applicants answer- working from home
Applicant asked if we do drug tests
Applicant couldn't articulately speak to skills they claimed expertise on their resumes
Applicant had very low energy
Applicant did not answer the questions that I asked or steered in a totally different direction than what is was that I asked
Applicant answered questions with so much focus on academia that it became clear that they had no business application
Told me up-front all the things they wouldn't be willing to do
People I hired:
Had the skills to do the job
Could articulately speak to everything on their resume
Could articulately speak to how they are the perfect candidate for the job
Understood something about my company
Up-beat positive energy and easy rapport
Nobody has ever done anything obvious like showed up late, dressed inappropriately or said totally inappropriate things. Though, when I interviewed for much lower skilled, lower paid jobs, that was an issue. Good luck, I feel like you got this!