1- How well educated was the Enumerator?. Penmanship etc.
2- Spelling by sound,
3- Multiple lettering.
4- Reduction of letters,
5- Vowel interchanging.
6- Misformed letters or look alike letters.
7- Listing of ethnic names.
8- Nicknames and abbreviated names variations.
9- Voluntary and involuntary information from the resident
10- Americanizing & Aliasing of names.
11- The small 'IF" and 'IS" bloopers. ( Jesse-Jefse etc)
12- Missing a letter or letters.
13- Resident not home. Neighbors answered questions.