When the streetcar pulls up to the school, it's on the street but when Ben gets on, it's in the woods.
During the part of the film which was set in October/November, 1954, the trees had way too many green leaves on them for Baltimore at that time of the year.
The toilet seat in the hotel room: down, then up, then down again just when she runs to it to vomit.
James Brown in 1954/55 was not a headliner, and he didn't record and release "Please Please Please" with a great deal of planning - it was cut with a single mic in a very haphazard way.
When Nate goes to pick up Ben from Little Melvin, the Key Bridge can be seen in the background. The Key Bridge was not completed until 1977.
On Halloween 1954 Adrien Brody's character states that he is dressing as a beatnik. The word "beatnik" was coined by Herb Caen in an article in the San Francisco Chronicle on April 2, 1958.
In Nate Kurtzman's office, Little Melvin refers to someone as the "Pillsbury Jew-boy," a slur obviously derived from the Pillsbury Doughboy. But Pillsbury's famous advertising icon didn't appear until 1965.
The film takes place in 1954, but the melody of "Bayom Hahu," which the Cantor sings during the Rosh Hashanah services, was written by Michael Isaacson in the mid-1980s.