For today's SNGF I used Family Tree Builder's tool "Tree Consistency Checker."  With a tree size of 2,200 names it listed 51 consistency issues.   At this point I don't know if that is a lot in terms of the size of my tree.  Additionally I have not checked to see if they are valid issues, or false positives.

Family Tree Builder does 38 checks

• Birth after death
• Died too old  (1)
• Alive but too old
• Child older then parent
• Parent too young  (7)
• Parent too old
• Child born after death of parent (1)
• Fact occurring after death
• Fact occurring before birth (1)
• Death date resembles cause of death
• Death place resembles cause of death
• Siblings Age (11)
• Siblings with the same first name (8)
• Descendants older then ancestors
• Descendant-Ancestor age mismatch (2)
• Large spouse age difference (1)
• Same sex spouses
• Married too young (3)
• Too young to be a spouse
• Inconsistent  name place spelling
• Place name resembles date
• Tagged in photo before birth
• Tagged in photo after death
• Inconsistent surname spelling  (6)
• Wrong designation of husband or wife
• Multiple marriages of same couple
• Maiden name same as married name (5)
• Double spaces in name
• Prefix in first name
• Prefix in last name
• Suffix in first name
• Suffix in last name
• Alias in first name
• Alias in last name
• Siblings with different surnames  (3)
• Incorrect use of upper/lowercase (2)
• Year with two digits