Other mistake: At the end when Bond returns to the bedroom after the glass bottle fight with Nik Nak he says "hope you got all the glass out of the bed" but he just walked across the room in bare feet without a care in the world, which was completely covered in broken glass. Goodnight didn't have enough time to clean this up aswell in the time given.
Other mistake: Ms. Goodnight was surprised to learn that the car had become flying. There is no way she wouldn't have heard the jet engines and felt the take-off. Also the noise in car's boot must have been loud, but she talked into the walkie-talkie and it came out fine.
Answer: I haven't been able to find any information on its whereabouts so my guess would be that ended up like most movie props do. Either as a souvenir for one of the people attached to the movie, (actor, director, etc.) in storage (in case it could be recycled as a prop in another movie) or simply discarded when it wasn't needed anymore.
Andreas[DK]