Revealing mistake: In the beginning of the movie, when Jakob is chasing the newspaper, there are several times you can see the string they use to drag it.
Jakob the Liar (1999)
1 revealing mistake - chronological order
Directed by: Peter Kassovitz
Starring: Robin Williams, Liev Schreiber, Hannah Taylor Gordon, Eva Igo, Istvan Balint
Continuity mistake: In the scene where Jakob discovers Mischa sabotaging the cattle cars and tells him the first news from the radio, Mischa is struck by a guard and knocked off the train, rolling to the ground. He is then bare-headed, but when Jakob runs up to him, Mischa's cap appears on his head.
Jakob Heym: Hitler goes to a fortune-teller and asks, "When will I die?" And the fortune-teller replies, "On a Jewish holiday." Hitler then asks, "How do you know that?" And she replies, "Any day you die will be a Jewish holiday."