- Actor Allusion: When Abigail Thaw's character first meets Morse she wonders if they've met before. When Morse says no she says 'In another life maybe'.
- The Danza: Strange was given the first name 'James', in tribute to James Grout, who played the character in Inspector Morse.
- Hey, It's That Place!: Horsted Keynes Station (restored to 1930s Southern Railway appearance, and consequently painted green) stands in for Oxford Station (which, in the 1960s, would have been painted Western Region brown).
- I Meant to Do That: Meta example. According to creator/writer Russell Lewis, any anachronisms you may spot in the show have been deliberately put there for the benefit of those viewers of a mind to look out for them.