Went through carwash while in park?!?!

[monto]

I can't believe I have to post this and I am more than pissed off at myself. Of all days something had to happen at the exact moment my 2008 3.0si hit 100,000 miles. It was complete coincidence that I pulled into the gas station at exactly 100k miles and thought I would honor the achievement by running it through the wash; I even spent the extra $2.50 for wheel cleaner. It's a conveyor car wash where the left wheels are pushed along by the rolling stopper which in turn spins the right side. I didn't notice until half way through, approx. 50 feet, that the gear lever was in park. I quickly pressed the break pedal which stopped the car, the rolling stopper subsequently just rolled under the rear tire and put it in neutral. Prior to noticing I was in park there was no awkward motion or jerkiness that one might intuitively expect. The car seemed to pull out of the wash fine and I immediately stopped to do a walk around and switch in and out of park and drive a few times; nothing out of the ordinary. After cursing myself in my car for the next few minutes I drove the 5 miles home, which included about 4 miles on the highway and didn't experience anything unusual. Should I be worried or take the car to be looked at? Is there an explanation or fail safe mechanism that prevents anything negative happening?

Thanks for reading and for any info you can share.

Cheers,
monto