it seems Tommy's origins are somewhat mysterious, some claim he's Polish with hints of French in his accent (teenage years in France).

Tommy Wiseau in "The Room", interviews and in the dialogue from "Disaster Artist" makes many the same mistakes Polish people do (omitting "a" and "an", adding a lot of "the" before names of people and places, false-friends expressions, like "doing sex" or "you think about everything", etc.). Also, the way he speaks sounds very much the same as Polish people speaking English.