Factual error: The pub sign states "whisky" - Irish whiskey is always spelled with an E.
Factual error: ***SPOILER ALERT*** When Padraic sets Colm's house on fire, he ignites the fires using a Zippo lighter, which would not be produced until 1933, ten years after the film is set.
Factual error: April 1st, 1923 was a Sunday, not a Friday as shown on Padraic's calendar in the film.