The shot of Metropolis after Lex has gone missing from hospital is the narrows of Gotham taken from Batman Begins.
The real island of St Kilda is now a bird sanctuary, 40 miles west of the Outer Hebrides and about 100 miles from the mainland of Scotland. There is also a British military base. The island's native population was voluntarily evacuated in 1930. There has never been a castle there.
The song the clock plays is the traditional Scottish folk song "Loch Lomond."
There is actually no Saint-Christopher cathedral in Montreal.
Teague asserts, like Patricia Swann did in "Traveler", that Lionel Luthor killed the Queens and Virgil Swann. While it's highly likely Lionel did have the Queens killed (since he ended up with their key) it's highly unlikely he killed Swann. Swann died during a period in which Lionel was undergoing a conversion experience, trying to be a better person than what he was. While this conversion experience did end, it wasn't until sometime after Swann's death.