When Phil is telling Geoffrey about his day at work he takes an aspirin and drinks the water. The glass of water is almost gone. But if you look closely a couple of shots later the glass is full of water again.
In this episode it makes clear that will is 17 and Ashley is 9. In later episodes like her first date Ashley is 12, but will has not aged in the series.
When Uncle Phil drinks water for his second Aspirin, he drank probably about 1/4 of the water. In the next shot, the glass is almost empty. After this second shot, the water is 3/4 full again like how it looked like after Unle Phil drank the water.
Geoffrey comes in with aspirin and a glass of water for Phil. The glass of water changes during shots, even though Phil has not drunk it.
Will pawns Ashley's violin. Will is only 17, so as a minor he would not have been able to legally pawn anything.
Phillip asks Geoffrey to put on "the Brandenburg Concerto". However, there are six of them. Phillip considers himself a lover of classical music and should have known to ask for one by number. (In any event, they play the opening notes for the Brandenburg Concerto Number 2.)