If the answer is X Units (example: 100 lbs.), allow them to leave off the unit
If it's a date, allow any format of that date
If it's a phone number, allow different formatting for the number (with or without dashes, with or without parenthesis)
Accept common abbreviations
-If it's a city, accept the city, or the city, state or city, country (ex. Paris or Paris, France)
-If it's a country, accept all official and common names of that country (ex. USA, U.S., US, U.S.A., America, United States, United States of America)
Feel free to do anything else you can think of to make the answers forgiving.