Miranda Hart (Miranda), Patricia Hodge (Penny) and Tom Ellis (Gary Preston) are the only actors to appear in all 20 episodes of the series. Sarah Hadland (Stevie) did film scenes in all episodes, however her appearance in Just Act Normal (2010) was cut from broadcast.
Sally Phillips (Tilly) and Miranda Hart (Miranda) previously worked together on various episodes of Phillips' sketch show, Smack the Pony (1999), which was Hart's television debut, and a single episode of Hart's comedy show, Hyperdrive (2006).
The set for Miranda's shop was previously Edina's kitchen on Absolutely Fabulous (1992). The most obvious part being the very distinct staircase on the screen left hand (back of the shop), with the main part of the shop floor, shopfront door and windows on screen right, being re-configured walls from the large dining table area in Edina's kitchen. Fan theory could easily place the buildings from both unconnected series as part of the same street. Edina's larger home at one address, and Miranda's shop and flat as a different address.
Miranda Hart (Miranda) and Tom Ellis (Gary Preston) have worked together on the TV show, Monday Monday (2009). They played Tall Karen and Steven respectively.
Miranda's pink desk chair is the same as Geraldine's green one in 'The Vicar of Dibley' finales. Miranda Hart had a guest part in the previous episode.