The Morrigan was the Irish goddess of war. She was the main opponent of Cuchulainn and often connected with crows. The novel is semi-autobiographical and this is both a nod to Caitlin Moran's Irish ancestry and a pun on her name.
Beanie Feldstein spent a month living with Coky Giedroyc in Wolverhampton to help her get the accent right. Feldstein even had a job working in a local bookshop and was forbidden to use her native Californian accent.
Because of the coronavirus pandemic, this played in drive-in cinemas in the USA, but went straight to a digital release in its native UK.
Johanna's "God wall" - in which she has pictures of all her idols pinned to her wall - was inspired by Caitlin Moran's own wall which she had up in her bedroom when she was a teenager.