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The song that David and Maureen dance to is 1983 UK novelty hit 'Superman' by Black Lace.
This is the first time Reece Shearsmith, Steve Pemberton and Mark Gatiss have performed together on screen since the final episode of The League Of Gentlemen in 2002.
The 'clown car' Mr Jelly drives is actually a hearse - the slogan on the side of the car is 'Keeps kids quiet'.
Lorna, the girl who's hair Mr Jelly is combing at the birthday party is Holly Shearsmith, the real life daughter of Reece Shearsmith.