"...on that slender riotous island which extends itself due east of New York-- and where there are, among other natural curiosities, two unusual formations of land. Twenty miles from the city a pair of enormous eggs, identical in contour and separated only by a courtesy bay..."(Fitzgerald 4-5)
In particular, Fitzgerald's character Nick Carraway "fills in" the reader by describing not only the time and place of the book, but also elaborates on just how extravagant some of the houses located there are. He discusses Gatsby's Mansion., he discusses The Buchanans' and he discusses his own home.
Gatsby's Mansion:
"...a colossal affair by any standard-- it was a factual imitation of some Hôtel de Ville in Normandy, with a tower on one side, spanking new under a thin bead of raw ivy, and a marble swimming pool, and more than forty acres of lawn and garden," (Fitzgerald 5)
(This.looks.like. a. resort... I can't believe this is someone's actual house (mansion, castle, whatever)!)
The Buchanan's:
"a cheerful red-and-white Georgian Colonial mansion, overlooking the bay. The lawn started at the beach and ran toward the front door for a quarter of a mile, jumping over sun-dials and brick walls and burning gardens-- finally when it reached the house drifting up the side in bright vines as though from the momentum of its run. The front was broken by a line of French windows..." (Fitzgerald 6)
(To me, this looks like someone copied the White House, slapped on some red bricks, maybe did some more extravagent landscaping...)
In contrast he describes his own more "humble" abode by simply saying
"My own house was an eyesore, but it was a small eyesore, and it had been overlooked," (Fitzgerald 5)
(Well, I think poor Nick could cut his place some slack; it isn't the house's fault it's next to the Hôtel de Ville and the wannabe Red-Brick White House!)
I find the descriptions that Nick gives of these houses really give the reader a great idea of how these people must have lived, seeing as their houses were that crazy extravagant (I mean seriously, these people had to have had more house than they knew what to do with!!). I think they add interest and value to not only the understanding of the story, but also your own personal enjoyment. I also think it's really cool that the story itself is being told by Nick, where it is like someone on the "outside-looking-in", but he is still a part of the story himself.
Here is the trailer for the most recent Great Gatsby movie. (I still need to see this...)