Names - I noticed Seaghan when I first started to explore the 1911 census, and found that Woulfe does list it (with Shane) as a variant of John. I still find the original census site https://www.census.nationalarchives.ie/search/ easier to explore, wish they'd stuck with it. Using an asterisk as a wildcard will sometimes get a search further, and starting with it to, for instance, list all the townland names in a parish an ancestor live in might give you an extra step in a search.
Later on I'll start seeing how use of local (and global) saint's names was changing. A quick glance showed there were still no Jacinta/Jacinthas in 1926, so Fatima hadn't grabbed the imagination, but there were 7 Gemmas.
I hope they are going to make it possible to search by building. As it is I can drill down into the houses, sheds etc of people in the country (and two sets in Dublin, see below) but my father and his family were in a tenement and I'd love to know how many other people shared that house, and a bit more about how many rooms they occupied.
My paternal grandparent's families lived near each other, in number 2 and number 4 of a small street, but one was in a one-room house, one in a four-room house. I've seen pictures, it was a single story terrace, and I think they were next door neighbours, so I'm curious.
Also interested to see the g-grandfather who was excoriated by his in-laws as a Black Protestant Belfast Scottish Orangeman was a: baptised C of I in Dublin; b: listed as Roman Catholic in each census since 1901; c: had worked for Glasgow corporation in the years before 1926. In 1901 and 1911 he was a self-employed tradesman. Not listed, but I know that in old age he was caretaker for a C of I church in central Dublin.