This International Harvester:
http://www.imcdb.org/vehicle.php?id=513936
... is an S-Series.

Now pretty much...

http://www.imcdb.org/vehicle.php?id=106965

http://www.imcdb.org/vehicle.php?id=213483

http://www.imcdb.org/vehicle.php?id=44405

http://www.imcdb.org/vehicle.php?id=332137

http://www.imcdb.org/vehicle.php?id=418857

http://www.imcdb.org/vehicle.php?id=265670

http://www.imcdb.org/vehicle.php?id=223421

http://www.imcdb.org/vehicle.php?id=249906

http://www.imcdb.org/vehicle_471153-Simson.html

http://www.imcdb.org/vehicle_380037-Simson-S-51.html

For the Chevy II Nova should Nova be part of the model name or in extra info? We have them as both.

Good question. And what about the 400 and other numbers?

The model is name is Chevy II.
100, 300 and Nova 400 indicate the trim levels, so they should be put in the extra info.
They all should be listed like this.

You mean that all Nova are 400?
Or are there some just "Chevy II Nova"?

1962-63: Nova 400.
1964+: Nova.

OK, I'll already put in extra info the Nova then

Somebody already identified this one as a Dodge Diplomat:
http://www.imcdb.org/vehicle_435626.html

"police car fan" is not know for his reliability...
Can it really be identified as Dodge rather than Plymouth?

I'm sorry but I think you jumped the gun on the Chevy II/Nova. The 1968 models were all "Chevy II Nova". It was discussed here:
http://forum.imcdb.org/forum_topic-6684-44799-196869_Chevrolet_Chevy_IINova.html#p44799

Not sure about the other years, but should put over in "Naming Conventions" to get a consensus.

There aren't many 1968 in the list though

http://www.imcdb.org/movie.php?id=1004509531

http://www.imcdb.org/movie.php?id=486219

Make: Decaroli
Model: SL 751
Model origin: Argentina
(the body still Troyano Funke 2001 Autocar Piso y Medio)

http://imcdb.org/vehicle.php?id=479525

http://www.imcdb.org/vehicle_516717.html should be 1953 Buick Roadmaster Skylark [76-X].

http://www.imcdb.org/vehicle_497499.html
Maserati's website says there was a Biturbo 222SR from '91 to '93.

http://www.imcdb.org/vehicle.php?id=90403

http://www.imcdb.org/vehicle.php?id=229492

http://www.imcdb.org/vehicle.php?id=258613

http://www.imcdb.org/vehicle.php?id=129615

http://www.imcdb.org/vehicle_521427-Ducati.html

http://www.imcdb.org/vehicle_495839-Chevrolet-Impala-1959.html

1971-73 Plymouth Satellite, named a long time ago:
http://www.imcdb.org/vehicle_295799.html

www.imcdb.org/vehicle_494572.html should have Type DP moved to Chassis.