Police car detainee door do not open from the inside.
No reaction from Mrs Barnaby is seen to the fact her handpicked personal trainer is a serial killer using a fake identity.
Toward the bottom of Grady's hit list in the newspaper photo is Judge Jerrold, but on the handwritten copy Jones makes, he's written Jude Jerrold.
No landed gentry's family would ever eat on a formal dining table without tablecloth or placemats to protect the table varnish.