The communication that I received from the Archivist indicated that the microfilmed books were copies that were made at an unknown point in time, but that they were not the originals. These copies would be considered to be derivative in nature, and susceptible to transcription errors.
The Archivist also told me that they have the original bonds--we're ordering the bond of the child of Absalom whose the line of interest and will have an update when it arrives.
It is always important to include complete and accurate citations to the records that are being used. This situation makes it pretty clear why that's a necessity and why "Davidson County Marriage Records" is a woefully inadequate reference.