There is scene where Hugo finally stands up to his father David. This was filmed before a live studio audience and when Hugo actually stands up to his father the audience erupted into applause thus ruining the take.
The trivia items below may give away important plot points.
Although the series hadn't had many episodes at this point in the overall run, it had become a much loved, and popular, series since 1994. This is why the studio audience would have reacted with applause during the unused take of the Hugo standing up to David scene.