The Kidney's All Right - S3-E9
Character mistake: Arthur wants to donate his kidney to Derek. It is claimed that he must be a match since he has O negative blood, but blood type is not the only thing required for a kidney donor, there are several other factors that could very well disqualify his kidney for Derek.
The Kidney's All Right - S3-E9
Revealing mistake: When Paul has a flashback to when he was bullied by Butch, it is quite evident that the school is the exact same set as City Hall. (00:09:00)
The Kidney's All Right - S3-E9
Visible crew/equipment: At the hospital when Mike introduces the Derek, a boom mic can be seen at the top of the screen. (00:03:30)
