The picture postcard seaside town of Albany, on the southern coast of Western Australia, was not only cinematically and logistically perfect for the needs of this family film, but also had strong family connections for a number of cast. This included and nature loving actress Emma Booth (Claire Phee), who was born in nearby Denmark, and actor Joel Jackson (Rich Uncle Brian), who actually was born and raised in Albany,
One of lead actor Daisy Axon's favorite films is 'The Parent Trap' (1961, 1998). On the set of 'H is for Happiness' (2019), Daisy loved having a double who looked like her twin.
The character of Candice Phee (Daisy Axon) turns thirteen in the movie. During production, both actress Daisy Axon and actor Wesley Patten turned thirteen during the shooting of the film.
Actress Miriam Margolyes loved entertaining the children during set ups by breaking wind quite loudly in front of them. She would make the announcement: "Fart coming!".
The real name of the mini horse is Yankee Doodle and he lives only twenty minutes from the forest where most of his scenes were shot. His owner has walked him there daily for most of his life.