Piper initially touches Prue's head with the boxing glove with her left hand, but in the next shot she's touching Prue's head with her right hand.
Before Prue casts her spell, Piper's hair is down but when she runs up to the attic it is suddenly up in a ponytail.
When Andy pulls out morgue tray at end to show Real Prue the Pink Prue body, only Pink Prue's pink sweater should be on the tray. Her blouse and skirt should have disappeared when Pink Prue disappeared.
That would be true if all the Prues had not changed clothes earlier in the show. When Pheobe hands out the colored sweaters to the Prue all three of them are wearing different black dresses therefore Pink Prue's blouse, sweater and skirt would have remained after she disappeared.
In the very last scene, Andy is looking at the tickets to the Bay Area Music Awards, and they are paper-clipped to Prue's fingerprint chart. The D.O.B. on the fingerprint chart is listed as 2-16-72.
When Helena runs out of the warehouse after he brother you can clearly see the wires of her mic pack dangle out of the bottom of her top.
When Phoebe asks Andy what color sweater the first dead Prue was wearing, Andy says, "I think the report said pink." Why would he say this if he saw the body himself?