Maybe this was talked about on this newsgroup before, but I was recently re-viewing my old season 2 video tapes and noticed something in that episode where Pheobe finally summoned the courage to visit her father (but was unable to do so because the small dog kept attacking her): The dog's trainer's hair could clearly be seen thru the window of Phoebe's granny's cab at that moment when the dog is 'perched' up on the window of the car on the side where Joey sat...
They could have taken more pains and re-shot that scene...