Murdoch and Linney use the British pronunciation "aluminium", although at one point Murdoch seemingly reverts to the American "aluminum".
When Detective Murdoch's father Harry decides to start a new life and change his name, he changed it to Smith. Stephen McHattie, who plays Harry, was born Stephen McHattie Smith.
Jasper and Murdoch are half brothers. Harry is their father. He and Jasper's mother never married, and she left him, before Jasper was born. Harry did not know she was pregnant and never found out about it until Jasper was an adult.
This episode takes place in 1896.