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Don Knotts played himself in The Spooky Fog of Juneberry and the Homer Pipsqueak in Guess Who's Knott Coming to Dinner.

He also voiced the spooky groundskeeper in Scooby-Doo! Night of 100 Frights.[1]

References

  1. 1

http://voicechasers.com/database/showprod.php?prodid=2855

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