Factual error: Eddie specifically tells the gang not to take his mom's "Delicious Deals" snacks because his mom loves them. But Delicious Deals are made by Mrs. Freshley, a company that was not founded until 1994. The boxes used in the movie even include the modern design that can be found today in most Dollar Tree stores. (00:23:00)Stan McCulloch
Factual error: When Stanley is at synagogue practicing for his Bar Mitzvah, and the Rabbi tells him to close the book, he does so - and a clear shot of the book cover from Stanley's left shows that the book (in Hebrew) is upside down. Hebrew books read right to left - the cover should be on Stanley's right, right side up.
Factual error: When passing under the railway bridge not only are the cars modern but there is also a Canadian Tire container on it which is a Canada only store, and doesn't ship by rail in the USA.
Trivia: Cary Fukunaga, whom is perhaps best known as a director on the series "True Detective" and for his works on films like "Jane Eyre", was originally contracted to write and direct the film. He eventually left the project after creative clashes with the studio, as he wanted to make a more unconventional film and executives feared his vision would not sit well with mainstream audiences. Fukunaga is still credited in the final film as a co-writer, however as many scenes from his version of the script were preserved in the final film.