There were various Macs through the years, including a SE/30, PowerMac 6100 and a Duo with Dock. The last one I remember was a 20th Anniversary, but that's so easily recognizable there may have been one after that I'm missing.

IIRC, in one of the DVD commentaries they talked about the Macs and noted that none of them were paid for by Apple, that's just what they used (or something to that effect). Sort of like his Superman promotions.