Malcolm David Kelley played 'Walt' in the TV series "Lost". There is a cameo in the video by Harold Perrineau who played 'Walt's' father on "Lost". There are several other Easter eggs in the video which reference the "Lost" series.
Tony Oller also played a character named 'Walt'. He played 'Walt' in the TeenNick series "Gigantic" in which he co-starred with Malcolm David Kelley as his best friend in the show.