While trying to do some stats for the 'critical mass' question I ran into some logic errors in the data dump that made generating the statistics impossible. I'm not sure if the errors are on my end or not, so simply telling me whether or not you get the same results would be helpful.
The following are the errors I found (which may or may not actually exist):
View count is an attribute of Questions, not answers - 5 Results.
SELECT COUNT( * ) FROM posts WHERE ViewCount !=0 AND PostTypeId =2 ORDER BY ViewCount ASC
Post was edited before it was created - 4 results.
SELECT COUNT( * ) FROM posts WHERE LastEditDate < CreationDate AND LastEditDate !=0 AND CreationDate !=0
An answer contains tags - 1 result
SELECT COUNT( * ) FROM posts WHERE Tags != "" AND PostTypeId =2
Answer was created before its question - 93 results
SELECT COUNT( * ) FROM posts v1 JOIN posts v2 ON ( v1.ParentId = v2.Id ) WHERE v1.CreationDate < v2.CreationDate
Comments created before before a post - 47 results
SELECT COUNT( * ) FROM comments LEFT JOIN posts ON ( comments.PostId = posts.Id ) WHERE comments.CreationDate < posts.CreationDate
Additionally, simply for completion, OwnerId="" when users have been deleted. This issue has already been resolved and will be removed from subsequent dumps.
The error that actually stemmed this post was
SELECT COUNT( * ) FROM votes LEFT JOIN posts ON ( votes.PostId = posts.Id ) WHERE votes.CreationDate < posts.CreationDate
but I have since remembered that the original vote table has dates rounded down to the nearest day.