Other mistake: Before the battle, the leader of the waterbenders says that he will have everyone extinguish as many sources of fire as possible. When the firebenders come up from the ground at the start of the battle, all of the torches lighting the city are lit.

The Last Airbender (2010)
Trailers
Directed by: M. Night Shyamalan
Starring: Dev Patel, Nicola Peltz, Jackson Rathbone, Noah Ringer





Answer: The TV show Americanized the pronunciations whereas the movie said them correctly.
The show is American, so with original characters you're allowed to say them how you want.