Cute Poison - S1-E4
Revealing mistake: Near the end, when Michael is unscrewing the sink before kicking the wall in, watch his hands in the foreground while he is talking to Sucre. Just when Sucre says "But what you were doing up there in the infirmary." Michael starts using his fingers to take the bolt out. You can see that there is no bolt, just him turning air, with a mystery 'unscrewing' sound effect. (00:39:35)
Revealing mistake: When Pope bursts into the infirmary and sees Westmoreland's body, watch the collar of Westmoreland's jacket. You can see it moving up and down as though he's breathing. (00:03:30)
Revealing mistake: After Pope enters Scofield's cell to see the escape hole, we see him standing outside the cell looking out at everyone throwing toilet tissue etc. If you watch closely right after we see a guy pulling his pillows toward him to tear up, it cuts to another inmate who is throwing stuff out as well. Only thing is, we see the cell door slides to the side slightly which would indicate that the cell doors where not locked. In the event of an escape, lockdown would happen immediately, with all cell doors locked with the prisoners inside their cells. (00:04:00)
Revealing mistake: Michael climbs out of the hole during the escape in his coveralls. When he looks down to shout to the others to say it's clear he has no top on. The shot is reused from when he first climbed up. (00:37:10)
And Then There Were 7 - S1-E11
Revealing mistake: When Nick is shot by Quinn, a blood pack is briefly visible under his shirt. (00:13:20)
Riots, Drills and the Devil: Part 1 - S1-E6
Revealing mistake: One of the rioters uses a fire extinguisher to try and break a door down. However the extinguisher is seen to bend and flex. (00:36:40)
Revealing mistake: Just after we see the inmate get stabbed there is a shot during the quick montage of one inmate holding the door, while his cellmate climbs up onto the bed for a better look at what is going on. In this very quick shot, the cell door moves despite the fact A wing is on lock down. (00:07:15)
Answer: Don Self actually worked with Whistler before he died. And Whistler with the bird book actually knew where Scylla was.