In 2002 , he appeared again with Scooby - Doo in the video game Scooby - Doo !
The portrait in the film may be the last visual image of Knotts in a motion picture .
In 2002 , Knotts appeared again with Scooby - Doo in the video game Scooby - Doo !
The portrait in the film may be the last visual image of Knotts in a motion picture .