I know the conventional thinking is that the trim tag was only for Fisher body assembly but maybe there was a reason to have items on the trim tag that were not only for Fisher but also needed for scheduling the main line.
If you look at some of the engine and trans codes and other codes, I don't know if they were all needed by Fisher.
A good example is the large number of option codes on 1967 Chevelle BAL trim tags.
In the example of the 68 dash no paint code for nose stripe delete cars ........
Fisher did not put on the nose stripe but maybe the trim tag still needed to show a stripe delete Camaro.
A possible reason would be for some of the "scheduling rules" JohnZ mentions in the research report on the assembly process.
If the special paint and other special order cars need more time or special tracking to meet special parts, process, or something else, that info would need to be considered when they were put into sequence. For example they may have needed to be sequenced together in some cases for assembly efficiency or paint efficiency but in other cases may have needed to be separated because of higher work station cycle/dwell times.
Even though Fisher would not have to know what nose stripe was used or not used, the trim tag may still needed to have the build order info on it for the scheduling.
here are quotes from JohnZ's report on assembly that I am referencing .......
"Scheduling: There were usually six lines in the schedule bank - one for RS, one for A/C, one for SS and Z/28, and three for high-volume standard cars, so cars could be scheduled without having situations like three A/C's in a row, three consoles in a row, three RS's in a row, etc., as these had higher work content vs. the standard cars and scheduling two or three of them in a row would over-cycle certain line operations. "
"Releasing: When the clerk at the end of the body bank selected the next body based on the scheduling "rules" and released it from its line into the main conveyor to the Trim Line, the computer released the "Broadcast" file with the next sequence number, and it was sent to many teletype printers throughout the plant where subassemblies were built and sequenced for delivery to the Main Line to meet up with that particular car. The same computer program also generated the end-of-line paperwork for that car - the price sticker, car shipper, and other internal documents. "