I've been looking though many of the Alabama State routes, and can't think of too many missing points, other than minor roads that some folks* might use as county-line "spinbacks". But unless there's a reason for the roads to be included, I don't know if every county line waypoint should be included.
As per a PM with
froggie at AARoads, I've checked out about 1/3 of the usaal roads point-by-point. So far, nothing looks out of place. I see a good number of connections at all other SR's and many of the longer CRs or local roads.
Unfortunately, I can rarely promise a check them in the field for accuracy, because work takes me all over the country, but I take a ton of photos and browse the ALGIS features for reference.
* Weasel word or self-incrimination?...you be the judge.