In reality there are some differences in the harvest times for the various berries. Which is a good thing because otherwise you'd get awfully busy picking them all at the same time.
It's not a typo, the mum likes to call Arno by nickname Aru (previously translated as Ar(アルちゃん - Al-chan) but I thought Aru would be more fitting) but ty anyways~
Huh, didn't know cranberries were native to Scandinavia, even though I live here. Still seems odd to pick cranberries rather than lingonberries though, as they are basically equivalent, and the latter is over a hundred times more common to find and forms a staple of Nordic cuisine.