This episode was originally entitled "Control Issues" before being changed to "Controlling Interest".
Guest star Douglas Smith (Gavin) is the brother of Gregory Smith (Ephram Brown).
Stephanie Niznik (Nina Feeney) does not appear in this episode despite being credited.
When Ephram is in the library with Madison, he pulls the same book out of his bag twice.
In the library, when the camera is at Ephram's back, his left arm is resting on the table. When the camera is facing Ephram, his left arm is down by his side.
When Amy is in her room with Tommy, her hair is in her eyes. However in the next shot, her hair is off to one side, but goes back to being in her eyes when Edna enters the room.