When Richards, Weiss and Laughlin are sent through the rocket cage tunnel at the beginning of the game show, there is a camera angle that obviously shows the rockets to be going in tandem (one tunnel). This cannot be the case as when Richards hits the safety net at the bottom, he would almost immediately be rear ended by the following rocket (possibly ending Richards game before it had begun).
When Richards is fighting Fireball, he throws several 55 gal barrels at him. The barrels he picks up are made of lightweight polyethylene; however in the following shot, they have been replaced by much heavier steel drums.
At 15 minutes into the movie, when Killian gets out of his limo at the ICS building, he opens his own door fully, with nobody else in the shot, and then the camera angle changes to see a security guard holding it open for him.
During the battle with Buzzsaw and Dynamo the camera changes to the stalker locker room and shows Fireball sitting with a woman in silver and a woman in blue and Capt. Freedom in the background. Later in the scene it shows Capt. Freedom where Fireball was sitting with the two women. But the third time, it shows Fireball back with the two women and Capt. Freedom back in the same position in the background he was in the first shot.
During the aerial attack on Bakersfield, the helicopter's computer shows the Bakersfield coordinates as Lat 45.04 N, Long 119.06 W. These coordinates are actually in the area of Umatilla National Forest of northeastern Oregon, just west of the 395 near Dale. Bakersfield, California is actually Lat 35.37 N, Long 119.02 W. Someone might have typo'd the 35 to 45, but even then, the coordinates are south of the Maricopa Highway, on Snapp Road!
In the beginning of the film, Weiss is shown looking at a computer monitor while a guard enters a code to deactivate the security system. He's wearing a shirt with the word "trusty" printed across it. The word that's much more frequently used is "trustee", because it has a more legal connotation . . .
When Daemon Killian is killed at the end of the movie. He is placed in the main rocket chair that sends him to the beginning of the maze. At the end of the maze, there is not net so he falls to the concrete ground due to the force and speed of the rocket and hits a side wall and again to the floor. The next shot you see him again on the ramp and this time flying straight into the wall on his own picture and Ben Richards says that hit the spot. He should have been sliding straight into the wall not fly in it. Or again fly in it straight out of the maze but never hit the floor and re-ramp.
When Richards kills Fireball, he does this near the corpses of last year's winners, however at TV time the crowd doesn't know this, as they can't see the dog tags around their necks, and the TV crew could easily have muted the transmission later. When Mick's film at the end shows the crowd who the bodies belong to, they show surprise. This is because they realize Killian has been lying to them.
There is no explanation of how Mick's group could have obtained the photos of the deceased Whitman, Price and Haddad which they included in their "Killian is Lying" montage shown to the studio audience in the film's final act. The deaths of the three previous "winners" were closely guarded secrets by I.C.S., there were no surveillance cameras in the area where their remains were discovered and where Fireball met his fate, and neither Ben Richards nor Amber carried any photo or video equipment.
Ben Richards uses Amber's pass (it works as a passport) at the airport and the guard doesn't question why he's using her card (plus he doesn't have one, and due to laziness from the officer they manage to breach security)
When Ben confronted Amber about who she was and Amber revealed that she took over the apartment a month ago from the brother since he was getting "re-educated", since Ben used the same pass-code and it worked with no issues, wouldn't a new tenant either get a new pass-code or if not change the current one to be safe.
Early in the movie a commercial for "The Running Man" is shown. All of the scenes in the ads are clips from the "live" show featuring Ben Richards which obviously could not have been shot yet as the ad predates the show.
The goof item below may give away important plot points.
Fireball's death is captured on the show but the moments earlier when Amber discovered that the three "pardoned" prisoners were dead apparently weren't filmed even though the show is broadcast live - very convenient for a show that tends to hide the truth.