Visible crew/equipment: In "The Desparate Hours", right at the end when Barraclough is in Fletcher's cell, when Fletcher says, "I never heard nothing" you can see the shadow of the boom mic on his face.
Visible crew/equipment: In the governor's office, when Urwin tells Barrowclough that the governor was instrumental in his plan, the overhead mic is in shot at the top of the screen.
No Way Out - S2-E7
Revealing mistake: When Fletch falls through the hole in the yard, this is obviously performed by a stunt double as he has a different hairstyle to Ronnie Barker.
Revealing mistake: During the riot scene, the canteen walls wobble. This is most noticeable when a prisoner is trying to pull the notice board off the wall.
Continuity mistake: Just after Warren says "we want a riot," the canteen door is already open and the prison guard is seen going through it. A few seconds later the guard is seen again banging on the door to get out.