I am familiar with the MPV, and it being a RWD. The car never really impressed me, but it did some of my friends, and they owned them, so I got to know some of their quirks.

If the car was fishtailing, then both drive wheels had lost traction. It might have started with the right side, and that might have been spinning far faster than the left, but fishtailing requires both wheels to skid. One wheel spinning on hard turns was something I became quite familiar with in 240s, especially in evasive driving tactics in the special course I had to take. Coincidently, 244s were the majority of fleet for the instruction group.

All that happens when a single wheel spins is that you loose momentum in the turn, and the other wheel holds the car to the surface of the road. You only fish tail when the outside wheel breaks free. The reason you skidded back the other way is because when you let of the gas, the instant sudden change in speed combined with both wheels not having traction forced it that way. This is not an uncommon event, especially if you have a gear ratio that has the engine fairly reved up at the speed you are moving. The MPV was one of those sorts of cars. Revs in the 240 are lower.

Read Robert Ludwicks comments on how you use your engine to brake your speed, its really a solid technique. And certainly one that I use with great success.
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