The Karac family are relatively recent immigrants from Hungary and yet Carla (Julie Sommers) has not even the slightest hint of an accent like all of the other members of the family.
Joseph, assisted by Kimble, operates on Mackin. After the operation, they go to wash their hands at the sink, BUT neither has ANY blood on their hands or clothes.
When Detective Sergeant Charney is in the Karac apartment and is questioning them as to the whereabouts of Ben Russell aka Dr. Richard Kimble, he refers to Ben Russell as Doctor Russell.
Joseph, assisted by Kimble, operates on Mackin. Even though both are doctors, neither washes their hands first.