As an in-joke, they interview Buck, or more accurately, a briard called Buck. This is completely out of place for two reasons: 1) The original Buck died in 1996, and 2) in a Season 10 episode of the series, Buck's death was addressed and showed that he was reincarnated as a cocker spaniel named Lucky. Therefore, "Lucky" should have been the one interviewed, not "Buck".
At one point, the narration says the series was canceled in 1987. The show was actually canceled in 1997; it premiered in 1987.