How can incorrect information on a Catholic baptismal record be corrected? My mother was baptised Catholic in 1923 but the baptismal record has a few mistakes on it not least the mother's name. 

Is it possible to have a baptismal record corrected and what forms of proof do I need to do so?
How can incorrect information on a Catholic baptismal record be corrected?

Start by going to the parish priest of the church in which the baptism actually occurred and explain it to the pastor in charge. This should be done in person and not over any sort of social media. Please phone in advance to make an appointment and to make sure the pastor not on holidays or way on business or studies. If you are know to the priest(s) of this parish church, there should not be too much difficulty in getting the records set straight. Make sure that you have all the pertinent information needed when you see him, such as official government issued IDs, the original baptismal certificate (if possible) and the appropriate birth certificates and or marriage certificates (if required because of a name change).

If this fails, then approach your local chancery office on how to proceed. If the baptism occurred at the cathedral (as in my case) you will need to start directly at the chancery office of the diocese. In this case the Rector of the Cathedral would be able to assist you in making any corrections necessary on the baptismal records.