You can do everything right on paper and still lose the job in the room. Most interview failures come down to a handful of avoidable mistakes. Here are the ones that do the most damage — and how to sidestep each.
Arriving late (or flustered)
In South Africa, unpredictable transport is a real challenge, which is exactly why you must plan for it. Arriving late signals unreliability before you have said a word. Leave earlier than feels necessary, and if disaster strikes, phone ahead immediately and apologise. Being ten minutes early, calm and settled is the goal.
Badmouthing a previous employer
Even if your last boss was a nightmare, criticising them makes you look like the problem. Keep it neutral: “It wasn’t the right fit and I’m looking for something more stable.” Never vent.
Not researching the company
When you cannot answer “what do you know about us?”, it shows you did not care enough to look. A few minutes on their website or Facebook page fixes this completely.
Letting your phone interrupt
A ringing or buzzing phone mid-interview is distracting and disrespectful. Switch it off — not just silent — before you walk in.
Giving one-word or rambling answers
Both extremes hurt you. “Yes” and “no” answers give the interviewer nothing; three-minute rambles lose them. Aim for focused answers of thirty seconds to a minute, which you can practise using common interview questions and how to answer them.
Talking mainly about pay and leave
Asking about salary and benefits is fair, but leading with it — especially early — suggests you care more about what you get than what you contribute. Let them raise money first, or save it for the end.
Poor body language
Slouching, avoiding eye contact, mumbling or crossing your arms can read as disinterest or nerves. Sit up, make natural eye contact, and speak clearly. A little warmth goes a long way.
Having no questions to ask
“No, I’m fine” at the end is a missed opportunity. Prepared questions show genuine interest — see questions to ask the interviewer.
Lying or exaggerating
Inflated experience or fake qualifications tend to unravel, either in the interview or later during checks. Honesty protects you.
Common mistakes summed up
- Late, flustered arrivals with no backup plan.
- Criticising former employers.
- Knowing nothing about the company.
- Phone interruptions.
- Answers that are too short, too long, or dishonest.
- Leading with pay and benefits.
- No questions at the end.
Mistakes specific to phone and video interviews
- Poor signal or a noisy background that makes you hard to hear.
- Taking the call while walking, driving or in a taxi.
- Looking at yourself on screen instead of at the camera.
- Forgetting to test your microphone and link beforehand.
- Being caught somewhere with no privacy, so you cannot speak freely.
Conversation mistakes people don’t notice they’re making
- Interrupting the interviewer before they finish a question.
- Not listening, then answering a slightly different question than the one asked.
- Over-explaining and talking long after you have made your point.
- Filler habits — too many “ums”, or nervous laughter after every sentence.
How to recover if you slip up mid-interview
Everyone makes small mistakes. If you give a weak answer, it is fine to say, “Actually, let me put that better,” and try again. If your mind goes blank, take a breath and ask for a moment, or ask them to repeat the question. Interviewers do not expect perfection — how calmly you recover often says more about you than the slip itself.
Do this now
Before your next interview, run through this checklist: phone off, company researched, documents packed, travel planned with buffer time, and two questions ready. Ticking these off removes most of the risk.
Frequently asked questions
Is it a mistake to admit I’m nervous?
A brief, honest “I’m a little nervous, I really want this role” can be endearing. Dwelling on it is what hurts you.
What if I genuinely don’t know the answer to a question?
Be honest rather than bluffing. Say what you do know, or that you would find out — that reads better than a made-up answer.
Can I bring notes into the interview?
A small notepad with a few points and your questions is fine and looks prepared. Reading full scripted answers off a page does not.
Is it a mistake to ask about salary at all?
No — it is reasonable. The mistake is making it your first or main focus. Timing and tone are everything.
The bottom line
Most interview mistakes are avoidable with a little planning and self-control. Arrive early, stay positive, research the company, and keep your answers focused. Avoid these traps and you are already ahead of most candidates. Pair this with how to prepare for a job interview.