I had the problem of the gear shifter not wanting to go into PARK and checked the forums for clues. After reading the other posts I immediatly called the dealer in PA. They offered to send a flatbed for the car, repair it and send it back. (We live 45 minutes away from the dealer). I offered to drive the car up there and leave it overnight, as I have heard scary stories of flatbed episodes.
They had another car come in with the same problem and they took apart the console and lubed everything up. They were falling all over themselves to make sure they had a happy Smart owner on the road. Kudos to our dealer.
If you experience sticking in the shifter, get it in ASAP before it won't go into PARK at all. Once that happens, you have to leave it in N and leave the key in it.