Shelob is not mentioned in The Hobbit. Shelob is later explained to have spawned the creatures that lived in Mirkwood. They are the ones that caught the Dwarves and would have eaten them if Bilbo hadn't rescued them.
Page three, that is, the first page of Chapter one
well, Ra (the sun god) is first mentioned on page 25 of the Golden Goblet. Thoth is first mentioned on page 18. Amon is first mentioned on page 26. Osiris is first mentioned on page 39.
Tolkien was grading papers one day and encountered a totally blank page in the stack. After a short pause looking at that blank page he wrote the first sentence of "The Hobbit" on it and set the page aside to resume grading. A few days later he began writing the rest of the story.
Golf is discussed on page 21 or another page. It depends on the book
whales are the first specifically named animal mentioned in the Bible
On page 85 of 'The Hobbit' Bilbo asks "What have I got in my pocket?"
It depends on the edition you have.
Page 152, Paragraph 3.
'In a hole in the ground there lived a hobbit. Not a nasty, dirty, wet hole, filled with the ends of worms and an oozy smell, nor yet a dry, bare, sandy hole with nothing in it to sit down on or to eat: it was a hobbit-hole and that means comfort.'
"Lure" is first mentioned on page 9 of "Island of the Blue Dolphins" by Scott O'Dell.
Driftwood is first mentioned on page 102 of the book "Hatchet" by Gary Paulsen, where Brian uses it to start a fire.
ding-dong-a-ling-dang (page 9 )