Michael Crawford based many of Frank's reactions on those of a young child.
Australia House (Series 3). When the phone rings asking Frank to go and have a look at the electrics in a house, the address he is given over the phone to him which is written down by Betty is "26 Upton down". However when Frank arrives the number on the door is 24.
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We asked Doctors Jo Wilson, April Kepner, and Andrew DeLuca to tell us the episodes of the show that they think are the most essential to understanding their characters.