All My Ex's - S1-E7
Corrected entry: At the end of the episode when everyone is in the interrogation room, Davis lists the mistakes made during the remodeling: the one-way glass was installed the wrong way, the intercom doesn't work, and the door locks from the wrong side. Oscar then discovers that they are all locked in the room. This is how interrogation room doors are supposed to lock, but judging by Davis' intelligence, he probably doesn't know that. (00:18:40)
Correction: So what you're saying is Davis is not smart enough to know the lock is supposed to prevent exit from the interrogation room. Which is in fitting with his character, and thus, not a mistake.
rswarrior