As a commenter has pointed out in an article about common mistakes made during an interview, interviews have increasingly become psychological and try to gauge how your personality can handle an intense situation rather than trying to find out your job qualifications and if you can do the job. Like it or not, folks, the main interest in the business world, where most projects are team-oriented, is how nicely you can play with others. The managers want an easy time themselves and don't want to be fighting fires from people with bad attitudes or rumor-spreaders. There are more important things to focus on, but if people are having a bad day or are at ends with another employee, it throws a wrench in the entire process and is unnecessary hardship when the game projects themselves are complicated enough. Most online websites will have you practice the same questions over and over again, but most do not prepare you for the unexpected and "curve-ball" questions that many employers actually prefer. They will try and set you up for failure, and expect you to escape tastefully.
A common example of a tough question is "tell me what you thought went wrong at your last studio/what you didn't like about your last studio." Like it or not, the interviewer does not expect this question to be answered. The best response to something like this is a direct: "I prefer not to speak badly about my last studio." If they try to act like your friend and say something like "come on, you must have something that you didn't like. You can tell me." Bull! They will constantly try and diffuse you to make it seem like it is not serious to speak honestly but they are looking for people who won't. Reiterate and say "I told you already, I am not going to speak negatively about my last studio." You would even benefit from adding something positive like "I learned a lot from that studio and I enjoyed the people I worked with and we worked our hardest to deliver the best product/game that we could." Your new potential employer will be impressed that you defend your last studio and are not easy to find the flaws in the new studio. They are really looking for someone who will not ruin their reputation or will be a complainer that will lower everyone else's moral.
Once you are at the studio, you will find that the same people that interviewed you will be quite open when they have something unpleasant to say about the studio, because they are already hired and know they are "safe." I believe in not complaining in general, unless you constructively see a problem and you are willing to fix it. I know, it sucks and it's unfair that employees feel that they won't be hired if they are not open, but some questions are expected to be dodged in a polite manner. Think of politicians: they are paid to escape tricky questions and to spin all details into a more positive outlook.
The employer mainly wants to see that you can handle these types of questions and know that sometimes it is better to not answer something than to be open about it. They are mainly looking for someone who can grow and who is pleasant to work with. These days, with large teams, and so much competition, there are a lot of people that can do the type of job you do. So, know that your personality will be closely scrutinized and you have to put on your Sunday's best for these people.
I've seen people drastically change once they are hired somewhere because they know how to play this game and can get jobs left and right but then always get fired or don't go very far in their current role. They are making it hard for everyone else who may be able to do a better job than them. You have to be realistic and know that this happens, though, and that you can't beat them bust must join them in being able to make yourself look as good as possible during an interview (this does not mean lying about your skills).
For me, it is difficult to not be truthful but I have found that sometimes keeping my mouth closed is better than revealing too much. Try it sometime: see how people don't have a problem if you don't say a lot when they ask you questions. Do this with new acquaintances to see if they like you or not: and I assure you that the whole conversation will go better if you don't say that one thing on your mind that you feel is really true but you know isn't the most acceptable.
Here is the article, but know that the questions you should be ready for in the interview are not the common ones that everyone expects: http://www.glassdoor.com/blog/6-mistakes-job-interview/
-Ken
P.S. I am convinced that the more difficult your job description and requirements, then consequently there is less competition and thus less difficult questions being asked during interviews. So, if you are an artist or programmer--where there is tons of other people who want your job--then you have to master how to interview...think of yourself as a newscaster or someone giving a demo at a conference. Also, this might not be said anywhere else but I went down the negative path on a question in an interview in the past and I caught myself in the middle. Since I was already revealing a lot, I figured I might as well stay consistent and keep answering the negative question. You will find out, though, that once you light a spark the interviewer will keep wanting to give you fuel to see how far you can take a negative comment. So, if you do find yourself answering something that you shouldn't have in the first place, take charge and show them that you still have power as an interviewee--by not finishing the answer. Say something like: "I don't like where this is going and I would prefer not to continue talking about that subject. I feel that this is not relevant to this interview and would like to get to more objective issues. This would also subtly tell them that you don't want to be harassed anymore with those exploitative questions. Make sure to do this politely and don't raise your voice or use too much emphasis in your wording.
