The two locations can be seen within reality T.V programmes today, Made in Chelsea ( Old Money, East Egg) and Jersey Shore (New money, West Egg).
Made in Chelsea is about cast of people, who are considered rich, glamorous and privileged. Many are from privileged backgrounds, coming from private schools and having they're parents successful businesses to help them achieve the social class as they use 'parents' help to buy into this lifestyle. Parties are considered to be extravagant and stylish with a touch of class to them.
Jersey shore is a programme about a group of unknown people who where placed together simply for a T.V show. Since the show has started many of the cast has now made millions from one the show and two by going off making their own businesses creating them even more fortune.
Parties here are not the same as 'East Egg' there more outgoing and less class.
I think that these two examples are good way to view the difference in the book between old money and new money. You can have so much money but then to have a high social class, added features like education is also needed to be considered when viewing class.