The child John is legitimate, the appropriate column on the left page indicates that. Also the child's parents are already married in the 1865 census with a number of children. The column appears to have been used for a note which may possibly list an alternative date of birth (fødsels dagen).http://digitalarkivet.uib.no/cgi-win/WebCens.exe?slag=visbas...http://home.online.no/~otjoerge/files/word.htm
Note - The permanent page link (rather than the image link) would be a much better option to give in this type of forum. It allows us to zoom in a great deal more which is very helpful with handwriting like this. It is much easier to make out a few of those words when we can increase the size 150%.