”And it was a coffin. Not a casket. Apparently this matters.”

Aaaahh, the old issue of ‘two nations divided by a common language’ rears its head once more! In the UK, where we tend to be less squeamish than the US about such things, the wooden box which contains the corpse is usually referred to as a ‘coffin’ - I don’t ever recollect hearing anyone here refer to it as a ‘casket’.