G'day, Mark .. I have a death registration number for two named James McCrea: 1858 and 1898. The one in 1898 (2896/1898) seems less likely because it's Parramatta and nothing we have ever known says he was ever out of the Sydney area. The one in 1858 (637/1858) seems more likely (but not guaranteed) simply because it's Sydney, the mother's name was Margaret (which would go with one of the daughter's being named Margaret) and because the (admittedly vague) stories in the family never mention either parent. That smacks to me of orphans. (But I could be running totally up the wrong tree there.)
I can't access the original (or films of) records the way I did back in th 1990s when I could just trot along to my local library, my State library or the State Archives. (That is one of my frustrations.) I have a newspaper clipping (or a copy of it) in my family records as inherited from my mother, that shows a funeral notice from a Lodge (presumed masonic).
There is no extra information on the marriage certificate. Just who, when, where, date, by whom - and the witnesses. (I have a paid for print from the microfilm of the original church register.) We're talking 1849 here, before official state records began .. so the state registry only has the info from the church register.
Re Ole. As I said - his information as per the marriage certificate (I have the official one from Qld Gov't) and the information on eldest son's (my grandfather) certificate (I have this, too) differ from each other. Money (lack of) prevents me from buying any of the other children's certificates, as there are too many of them. There was a family book, brought over to Queensland, prior to 1940(? Mother wasn't sure exactly when) by one of my mother's uncles. he had gone to Sweden after some newspaper advertising was looking for the family. The ads were placed by someone called Ake Wiberg (no guarantee that spelling is correct, but it's what my mother's notes record). There were copies of this book for each of Ole's sons (not one for the daughter, possibly because she was a posthumous birth and he never had a chance to record her birth with the family back in Sweden). Sadly the copy that should have gone to my grandfather was left in the care of his next brother down, because granddad was deceased by the time Uncle Henry went to Sweden. Another reason given was .. granddad had two children and there was only one book. So it got stored in the backyard shed, along with a large portrait of Ole's wife (my great-grandmother), and was destroyed beyond readability by weather. If I were in Queensland, I'd take a trip north to Townsville and Ayr and look up the cousins I know are there (even if the ones I met back in the 1980s are now deceased). At least ONE of them has to have the info I want .. or the family tree bug! :)
That fishing expedition is a different kind of brick wall. One I understand (and from which I, too, suffer) only too well. One day .. .. it is my dream to own ALL OF THEM!!!