One example of adversarial journalism would be a news station selectively choosing parts of a person's interview to air in an effort to mislead viewers on the person's opinions or beliefs. Another example would be changing the interview topic to one that discredits the person's opinions and tries to make the interviewee look bad. Statements are often taken out of context in an effort to harm the person's image and show the audience the person is in the wrong.
Another term for adversarial journalism is "gotcha" journalism, which reflects attempts to try to mislead interviewees into saying things that make them look bad. Another common technique is to use archived video footage along with interview footage to show a contradiction between a person's statements and what actually occurs.