Was originally a 2011 pilot on the American network ABC. However, Sharon Horgan reworked the script when the pilot wasn't picked up for a full season and collaborated with Graham Linehan on turning it into a British comedy series instead. It was picked up for a full season in October 2016.
Kevin's wife Jill never appears on-screen. Also, Julia and her husband Paul didn't share scenes together until the final episode of season 3, rather they only ever communicate via phone.
Joanna Lumley guest-starred as Felicity, Amanda's mother (played by Lucy Punch). Lumley and Punch also played mother and daughter in Ella Enchanted (2004).
The line Caroline says to Julia about being a mental patient (in S01E03) is a reference to Anna Maxwell Martin appearing as N in 'Poppy Shakespeare' (2008).
It has been announced there will be a spin-off series on the BBC focusing on Amanda and her children who are now both in secondary school.