The vehicles used came from France, Spain, England and Finland. They included a Shelby Cobra sprayed pink for Penelope Pitstop's Compact Pussycat and a real Sherman tank for the Army Surplus Special.
The Red Max's Crimson Haybailer and Dick Dastardly's Double O were the only cars to be created in post production.
The costumes for the Slag Brothers covered their torsos but the hair on their arms and legs had to be glued on each day before shooting.
The actor playing Dick Dastardly's wore a prosthetic nose and chin but his moustache was real.
The original Wacky Races characters not to appear were Professor Pat Pending in The Covert-a-Car, Luke and Blubber Bear in The Arkansas Chuggabug, and Rufus Roughcut and Sawtooth in The Buzzwagon.