Continuity mistake: When John is in his Manhattan apartment reminiscing, we see his daughter throw a ball at him. If you take a close look at the ball, you will see how beat up it is. However, when the ball is falling down the stairs in his rented house for the first time, it has become new and shiny.
John Russell: It's my understanding... that there are, uh... twenty-three students registered... for this series of lectures on advanced musical form. Now, we all know it's not raining outside, and unless there's a fire in some other part of the building that we don't know about, there's an awful lot of people here with nothing better to do.