The bagpipe song Sleep, Dearie, Sleep, was adapted from a traditional Scottish lullaby. The song urges its subject, a soldier, to go to sleep after what the listener can assume has been a long and difficult day at war.
When Prince Harry, Prince William and their friends are shooting BB guns, they are approached by three royal staff members. Harry comments "It's never good when they come in packs". This is the same phrase Queen Elizabeth II uses in Gold Stick (2020) when sitting on a hill while visiting Balmoral and several royal staff members approach her to deliver a message that Lord Mountbatten was killed.
When the Queen is watching home movies, it contains actual news footage of Elizabeth as a child, her father's funeral, she, her mother and sister in funeral wear, and her televised coronation.
Although the episode portrays Elizabeth as reluctant to begin planning her funeral, in reality planning for it began in the 1960s after she turned 40 and it had been revised many times by 2005.
The poem Prince Philip quotes to Elizabeth following the service is "Mac Flecknoe" by John Dryden.