To dream that you watch the Oprah Show, means that you have an admiration for this women and respect her work. It is very common dream for people to dream of what they saw on the TV, which is absolutely normal, because people spend lots of time at home. The Oprah could also represent you and the qualities you would like to see in her.
Dream dictionary: Winfrey, Oprah dream meanings
To dream that you are in the talk show of the Oprah means that you like to be surrounded by people. The dream could also represent the admiration you have towards this celebrity. If you watched TV before you went to bed, it is completely normal to have these kind of dreams. The Oprah is also a symbol of strong and powerful woman.