After Jim rejects Swifty's advance and shoves him to the wall, the amount and position of the blood on Swifty's face changes in subsequent shots.
The blood on the shirt of the kid shot in the classroom disappears between shots.
When Jim, Pedro, and Mickey steal the car to sell to Mickey's brother, Jim is smoking a cigarette which he takes a drag of then throws out the window. When Pedro nearly crashes the car, he is smoking it again.
Supposedly set in winter, yet deciduous trees with green leaves are visible.
After the boys jump into the river, there is a gash on the right side of Jim's forehead; after he takes the drugs out of the medicine cabinet, it is on the left side.
The NBA ball signed by the players was not around at that time; Spalding didn't start manufacturing the NBA ball until 1982 or 1983.
When Jim's mother throws his trophy out the window and the camera pans across to see it on the pavement, the actual one she threw can be seen behind Jim.
When Jim is playing basketball and explaining how he plays and Pedro steals from the locker rooms, each time there is a point scored, the crowd is heard to be cheering, but, visually, it is very calm.
When being picked up from the snow by Reggie, Jim bends his left leg even though he is supposed to be unconscious.
The film is set in the late 1960s/early 1970s, but Jim and his mates steal a Ford Taurus, which wasn't produced until October 1985.
Although this movie is based on an autobiography of a person growing up in the 1960s, it appears that there has been no effort to portray that era in the movie. This is evidenced by the fashions, music, cars, and backdrops used, none of which are from that era. The following are anachronisms in the 1960s:
- 1) modern-era vehicles seen in outdoor scenes;
- 2) numerous skyscrapers (in background shots) that didn't exist, including the Twin Towers;
- 3) modern medical equipment used to treat cancer;
- 4) Jim and Bobby are on post-porn-littered 42nd Street and reminiscing about the time when the area was filled with adult businesses; NYC Mayor Rudy Giuliani had the district cleaned-up in the 1990s;
- 5) Bobby refers to a porn movie with the title, The Sperminator, an obvious take from The Terminator (1984);
- 6) A marquee sign in the background reports "Two US helicopters down over Iraq" in reference to the Gulf War in the early 1990s;
- 7) During the basketball game where Jim and Mickey are too high to play, there are championship banners dated 1976 and 1988;
- 8) When the cops enter the ice cream store, they are wearing 1990s style police uniforms.
When Jim, in his dream, is shooting his classmates, the one who gets shot in the back has a visible string attached to him which pulls him to the blackboard. When Jim has a vision on the basketball court and gets blown by an explosion, the string is visible again. They were dream sequences, but it seems unlikely that he would dream of strings.
Shadow on the bathroom door when Jim is talking to his mother.