Meantime I made 4 cuts to show the difference. The times referenced here are approximately where they are located in the US DVD release. They're OGM and have both the Japanese audio track (took it from the DVD as it's much better quality and at least the audio track wasn't altered) and the English audio track (also taken from the DVD)
Mewtwo conjures up a storm 17:51 15.1 MB
New Island Castle and Mew flying in the clouds 25:34 2.2 MB
Entering the Castle's main hall, CG's especially blatant here 28:02 13.5 MB
You can't do this, Mewtwo... I won't let you 51:34 12.8 MB
Most of these clips are a little over a minute long, the second's only 20 seconds.