Delighted that you loved the graphic novel! It is (as far as I know) the only true graphic version of the story, as other versions (like the French Loisel) are re-imagined. Stephen White, the artist, has followed Barrie's story as faithfully as he could, including the text which is taken straight out of the play or novel.
As you've noticed, he's dotted the book with "Easter eggs" and it's fun to spot them. Some are probably more obscure than others, unless you know... Such as the opening image, which has Mrs Darling and Wendy in the gardens of Moat Brae on the shore of the river Nith in Dumfries (the house where Barrie played as a child). The goat in the background comes from Peter Pan in Kensington Gardens. The nursery was inspired by the backdrop of the original productions (designed by William Nicholson). Have you spotted the iconic portraits of Barrie on the walls? On page 26, Peter Pan and the children fly over Great Ormond Street Hospital, and you can spot the figure of Barrie walking by with Luath, his Newfoundland dog, in the right hand corner. The little house built by the Lost Boys for Wendy is based on the laundry house by Barrie's birthplace cottage in Kirriemuir. The book is actually stuffed with such references and allusions - plenty more to spot! Enjoy.