The basic info on the tags were pre printed before they arrived at the plants. Things preprinted were items like the NOR PNT, BDY the big disclaimer on the bottom of the 69 tags, so if someone in the supply chain made a mistake, like printing NBR on the tag it carried thru all the tags in that order. Maybe the order was for 1000 tags, 5000, or 10000 at a time, (roughly 1, 5 or 10 days production). The tags themselves got fed into the addressographs at the assembly and all the car specific info got added to the tags. If no one at the plant noticed the typos, they continued until the next batch of tags were received and put into the addressographs.