Continuity mistake: During the sequence where Ichabod and The Horseman are fighting on top of the carriage, it's quite obvious that the two horses Masbeth and Katrina are riding keep changing colour. Sometimes they are both dark brown but sometimes Katrina's is dark brown and Masbeth's is white.
Continuity mistake: When Ichabod is investigating Johnathon Masbeth's death, he notes that the neck wound was cauterized immediately, which explains why there's no signs of bleeding. At the beginning of the movie, when Van Garret is killed by the Horseman, a splash of blood is shown hitting the pumpkin that is used for the scarecrow.
Factual error: At the very end of the movie, Ichabod addresses to Young Masbath saying the final line "You'll son find your bearings young Masbath. The Bronx is up, the Battery is down and home is this way." However the Bronx was instituted only in 1898, a century later.