Continuity mistake: When Igby is at his Godfather's party, and is drinking from the wine glass with cigarette ash in it, the glass changes hands. When the ash is put into the glass, he is holding it in his right hand, then the camera angle changes and it is now in his left hand, where it remains for the rest of the scene.
Add timemandy gasson
Continuity mistake: In the death scene at the beginning, a spoon drops to the floor when the mother dies. At the end of the movie, in the return to the death scene, the older son is feeding the mother the poison and then sets the bowl and spoon aside. The mother never has the spoon in her own hand.