I think I saw that too! I am from Newton, IA where Maytag is headquartered and my dad is an engineer there. I almost crapped my pants when I saw the G4 cause they never have used Macs before in commercials if I recall. They have about 5 on the corporate campus itself! By the way, they gave about $500,000 to my school district and we bought all macs with it!
But back to the commercial, I thought I saw the PowerBook from the front, but I think from the back it was an actual PC computer. Maybe the close up of the desk was just this way. Would be interested to know if I caught this right!