Big Money Week does indeed mess with those definitions. In messing with them, I mean it can confuse a lot of people. However, it’s a great week and I guess the average player wouldn’t care as much if they’re considered winners or losers if that player won a significant amount of money.
Pass the Buck is still a car game regardless of whether Money Game is played immediately before or immediately after it. Money Game or any other car game would have no influence on whether PTB is a car game or a cash game if both were played within the same half. There was an episode more than 25 years ago where Money Game was played in the same half as the Card Game. Even though Card Game was played fourth, it was still a car game. Similar to PTB, Card Game made its debut (or was created) as a car game.
Not the best example, but if PTB offered a new piano as a substitute for a car (they would not) while the other prizes were nice cash prizes, possibly more than the piano, you'd be considered a winner (in terms of winning or losing) without the cash.
A better example might be Five Price Tags, which has been played right after One Away in the past. If that were offered as cash, with four smaller cash amounts plus a big cash prize of $60,000, a player could miss three choices, and still pick a tag that had $60,000 behind it. That would count as a win even though he or she left some money on the table for missing 3 of 4 guesses in the SP portion of the game