Deliberate mistake: When Phil wakes up at 6 AM, it's already bright outside. At 6 AM in February, it would still be pitch-dark.
Deliberate mistake: At the end of the film when Pacino and the gangsters are shooting each other on the escalator, the escalator takes a long time to get to the bottom, way too long.
Deliberate mistake: When "C" and Jane are walking home together and Jane pronounces "C's" entire name she says his first name Calogero as well as his last name Anello but he never told her his last name he only told her his first name when they met.
Deliberate mistake: The dummies are obvious when the jail bus is flipping over onto the railroad tracks.