In the New York game, #9 is left off Houston's board, supposedly out of respect for Moonpie. However, another player is seen on the track wearing the Houston #9 shirt during the game.
Plenty of times, one of the Houston skaters wears a number 3 shirt. The number 3 shirt should always be worn by a biker.
in the New York game, #3 is seen after he goes "off the board" (riding motorcycle 2) and #2 is also seen in the same manner later in the game.
At the beginning of the Madrid game, there is a shot of the crowd just after Jonathan E. takes possession of the ball for the first time; visible in the shot is the scoreboard, reading 1-0 Houston. Neither team has scored as yet.
At around 30:00 into the film, Jonathan E. is instructing other players. The rear shot of one particular player shows him leaning back resting on his elbows, while the front shot shows him leaning back on the palms of his hands.
The librarian complains that the computers have lost the entirety of the 13th century, which he says featured Dante and some corrupt Popes. Although Dante was born in the 13th century, he wrote his masterpiece - the Divine Comedy - in the 14th century.
Only one arena was used, but for the game that was supposed to be set in Tokyo, the scoreboard still showed "HOU" as the first team. The Japanese are known to be polite, but even they would not have put the name of the visiting team up first.
At the beginning of the New York game, after in many moments of the film where different characters have repeated that there would have been "no time limit", the scoreboard shows the countdown (starting from 20.00). However, this is not actually a goof, as the game was still going to have 20-minute periods, but there was going to be no limit to the number of periods; hence, "no time limit".
The chanting crowd in Tokyo, Japan mispronounces the name of their city. They chant "To-ki-o" instead of "Tô-kyô." Perhaps in this alternate future, dialects have changed.
Some of the long shots in the Tokyo game show an empty arena.
Some of the footage in Jonathan's multivision retrospective is from the Houston-New York game at the end of the film, right down to using the same exact shot of the burning player that appears later.
In the Tokyo game, when the Houston players line up to slow the other team, two adjacent Houston bikers both wear jersey #3.
At 18:14 into the film, the center set of drawers under the reception table is so far back they would be difficult to reach. Also, being so far back, you would not be able to see what was in the top drawer and would even have trouble taking anything out of it unless you removed it entirely.
In sports, on the scoreboard, the visiting team is always listed first and the home team last. In the opening game, which takes place in Houston, Houston is listed first, Madrid last. While it is true that this is a work of fiction, there would be no reason to break with this convention.
During the Tokyo game, after Moonpie has been hit, Jonathan E. yells "Over here, over here", but his lip movements in no way match his words. In a subsequent scene, after Moonpie has been hit again, Jonathan says: "Stay close", but again, his lips do not match what he is saying.