For me it is worth listing, it seems quite small due to small picture. I'd say that it is Biturbo rather than Quattroporte III, but I do not know if it is 2-door or 4-door (i.e. Biturbo 2-something or 4-something)

Isn't that a Quattroporte?
I haven't seen it, so by accident...
But I don't know if I had uploaded it, if I had not missed it...

Did you skip the Biturbo on purpose or by accident? It is enough visible to be listed I think

Finally Done (sorry)
http://www.imcdb.org/movie_93185-The-Hidden.html

Better screenshots of the Ferrari 308, Mondial and Porsche 928 that were already added.







Plus these, shown during the part in which the alien possessed man comes to a car dealership looking for a new ride.

- Lamborghini Countach
Two, red one on display inside the building and white one in the back parking lot.



Also there, shown in the background on grounds of the car dealership.

- Lamborghini Espada
Three of those, one silver or white and two dark red.



- Chevrolet Corvette C1


- Maserati Biturbo
Right by some old Ferrari or Maserati.



And last but not least.

- Lamborghini Miura SV
Same scene, parked outside on the street.