There are a few other things I would expect to see at Chaco Canyon, but did not. One was any evidence of weapons or military exploits. From all we know about North American natives, they have been a pretty contentious bunch. They were continually raiding each other, or trying to take territory from one another. Success in battle was very highly prized. There does not seem to be anything like this at Chaco.
It is interesting that the very same thing has been observed in the case of Teotihuacan. They did not leave any evidence of warfare, though the city was burned about the time it was abandoned. The city may have had a sufficiently strong economic clout to keep enemies from attacking.
Another thing missing from Chaco is any effort at ornamentation or display. Ther buildings must have been impressive because of their size, but there is no indication that they decorated them with gargoyles or images of saints. The Teotihuacan builders did put lots of frosting on their buildings, as did the Mayans and Aztecs. Chacoan pottery, however, does show some limted geometric design for decoration.
A third thing missing is graves. In most archeological investigations, much is learned from burial customs and burial artifacts. I have not heard about this type of data at Chaco, and I wonder why.