Factual error: During one of the many driving scenes we see many cars on the side streets. At one point you can see a Mercedes-Benz ML SUV parked on a corner. This model SUV was not made until 2000-2001. Since the movie is set in the mid 80's this is impossible.
Factual error: In the middle of the movie, Walt is waiting on a subway platform. A train goes by, and you can see an American flag on the side of the train. Flag decals weren't put on New York subway trains until after the terrorist attacks of September 11th, 2001.
Factual error: When the Berkmans are speaking to Walt's teacher about his plagiarism of the song "Hey You" by Pink Floyd during his performance during the talent show, there is a poster behind the teacher featuring the WWE wrestler Hurricane. This wrestler made his WWE debut in 2001.
Factual error: At the end of the movie, Walt enters the newly renovated marine exhibit of the Museum of Natural History through the Hall of Biodiversity. The Hall of Biodiversity did not exist in 1986, it was added to the museum in approximately 2000, and the marine exhibit was renovated about a year later.