The role is not mentioned after the first few weeks or months of the run.
He is never mentioned again after the end of this speech.
He is not mentioned after 1511, and was definitely dead by 1519.
She was told not to mention the operation to anyone after the war.
He was not mentioned in season two or after his departure from the show.
They are mentioned at the very start, and after that not once until their destruction.
They also continue to mention the song after that scene.
According to the same source, all four villages are mentioned after 1830.
None of the staff even mention the psychological after effects.
"Or maybe they did at one time, and sort of forgot to mention it after a while."