You go to the familysearch.org site and click on United Kingdom to get a list of all UK sources. You then click on England,Norfolk Parish Registers. Do not use the search box but click on the link lower down "Browse through 293,422 images". You then find the parish of Hunstanton in the list and click on it. You can then choose baptisms,marriages or burials and date ranges.
You can then manually scan through the images one by one or type in an image number to go to. It takes some trial and error to find the one you want! In the older registers baptisms, marriages and burials are grouped together by year so it may take some time.
Don't read too much into misspellings - it may be just a slip of the pen! You can check the name on the marriage record by looking at the childrens' baptismal records.