I have been doing quite a few TV series lately, and while looking at how others do them... I think I might be doing something wrong.

On cars that appear in more then one episode of a TV show, How should the episode be listed? like "1.*"?

I have been listing it by the episode number that the picture was actually taken from (That way the 'time of picture' matches the episode).


Should I change how I've been doing it?

Listing it with the episode from which the picture is taken is fine.
You can possibly mention in comments that it is seen in multiples episodes.
Some end the episode number by a "+" (e.g. "1.06+") if it is seen others episodes, which does not harm the sorting by episode number.

I use the episode number from were the picture is taken, I think it looks much cleaner in the database that way.

Ok, thanks guys! I will start leaving comments on the cars that appear throughout a series.

Depending on the cases, I either mention each apparence in the comment
e.g. http://www.imcdb.org/vehicle_140338-Dodge-Sprinter-2007.html
or the first appearance, if it is used in most of the episodes which follow
e.g. http://www.imcdb.org/vehicle.php?id=137154

I do the same as well, and list each major appearance in the comments along with episode numbers:
http://www.imcdb.org/vehicle_238742-Chevrolet-K-20-1985.html

I've been trying to get this car:
http://www.imcdb.org/vehicle_108298-Caterham-Super-Seven.html
out of the Episode 1.05 list for quite a while. It actually appeared in every episode, and only another Caterham Super Seven appeared first in episode 1.05 and then in 1.06.