In the original film, The Terminator, Schwarzenegger's character was a "Cyberdyne Systems Model 101". Likewise for Terminator 2 & 3.
However, in the video game adaptation of Terminator 3, this same cyborg is referred to as a T-800. Terminator: Salvation reused this same model name.
Was there ever an explanation as to how this paradox originated? Or was this just the most embarrassing fluke in film writing history?