Because the shop obviously does not follow the series exactly, we've developed a list with differences the shop and timeline of the shop has when compared to the show itself.
General:
Kings, queens, teachers, etc. are all new characters (aka shop NPCs).
The war has not begun.
Kahamo is the current Avatar.
Children born from parents of two different nations take after their mother by default and have a 50% chance of not being able to bend.
Characters 'grow' at an increasingly fast rate.
Earth Kingdom:
There is a legendary / very popular story book character in the nation named 'The Great Sheng'Shing'.
Women have been known to rule the varying cities. (This may also be the case in some city in the show we don't know about.)
There is a well-known town referred to as the 'town of glass'.
Fire Nation:
The Fire Nation has not defeated or taken over any foreign lands.
The 'Yu Yan Archers' are fairly new group named after the young Prince and Princess.
Hiyama is the nations capital.
There is a military base outside the palace.
Southern Water Tribe:
The tribe is run by a council of elders both male and female, not just male.
Northern Water Tribe:
Women are at least some what tolerated to learn bending since Kahamo was discovered as the Avatar.
The bridge in the tribe is known as the 'Makoda Bridge'.
Eastern/Western Air Temple:
Airbenders are still alive and living happily.
The temples are ruled by a single individual instead of a council. This person is Nayun.
Southern/Nothern Air Temple:
Airbenders are still alive and living happily.
The temples are ruled by a single individual instead of a council. This person is Gesh.
