Interesting coincidence that this subject has blown up all of a sudden.
Many other players (Rice, Garner, Ritchie, etc.) have confirmed that the game plan was changed at the last minute. Jerry Rice is the only one that has chimed in that Callahan didn't like them, although even that fact would not mean that Callahan intentionally threw the game. That's not a believable hypothesis. The next year it became clear that Callahan really didn't like many of the players or the organization though, and left on bad terms.
It's interesting how the former players who are currently employed in the football business have been the most critical of Brown's story. Some are even denying the game plan changed, which is ridiculous. That change is confirmed by far too many people.
The whole situation is an interesting microcosm of politics.