Sun Hill is celebrating its 50th Anniversary, but it has mentioned previously that Sun Hill Station had existed during World War 2.
Several actors can momentarily be seen waiting for their cue when the scene cuts to them.
Whilst awaiting backup June Ackland refers to SO19 as CO19.
When Jeff Clarke is shot, there is a one second delay between the sound of the shot and the blood pack exploding on the actor's chest.
After Jeff Clarke has been shot, the camera cuts to Terry Perkins. A camera operator is visible in the bottom left corner of the screen.
(at around 38 mins) A piece of sound or lighting equipment drops into view.
(at around 40 mins) A sound man can be seen running in the background carrying a boom microphone.
During the gun struggle in CID offices and the moving of the real Gabriel Kent's body, the studio lights are clearly visible and one boom mic also dips into shot.