(at around 37 mins) A constable has a notepad and pencil in his hands writing down details as he questions two ladies and a gentlemen. As the ladies go downstairs, the constable tucks the notepad in his belt as he briefly turns his back to the camera, watching the ladies leave. He immediately turns back to the camera to question the gentleman and now has the notepad and pencil in his hands as before, without reaching for it in his belt.
The pocket chess set used by Mr Armitage is the wrong way round. No experienced chess-player such as he is would do that.