When the Microsoft crew arrive at Apple's headquarters, they pull the car in to a parking spot with no spaces left on the passenger side. When the camera angle changes, there is suddenly parking spaces seen on both sides of the car.
In the scene where Steve Ballmer is discussing joining Microsoft in 1980 and Bill Gates says "Keep your friends close, but your enemies closer", Gates is initially shown typing on an IBM PC XT keyboard. Shortly thereafter, in the frame where he is hunched over the keyboard with Ballmer and Allen over his right shoulder, he has an IBM PC AT keyboard.
When Jobs and Wozniak bring their prototype to the Altair 8800 seminar, you can see Noah Wyle starting to ask about the Altair during the narration. After the narration, he asks the same question.
In the Hare Krishna dance scene, Jobs is wearing a flower lei in the closeups but not the long shots.
When Bill Gates and Paul Allen are working out of the motel they are staying at in Albuquerque, there is a sign in the window that reads "Microsoft". At that time (1975), Microsoft was spelled as "Micro-Soft".
Japan did not manufacture or use Microsoft-run computers when Windows was introduced, China manufactured the computers. Jobs states that his people came back from Japan with computers with the first copies of Windows.
In the opening scene where they are filming the 1984 Macintosh commercial, Ridley Scott calls the actress who throws the hammer Michelle. Her real life name is Anya Major.
Mike Markkula's name is misspelled (Markula) in the closing credits.
The text of the newspaper article shown near the beginning ("Boy Laughs and Computer Burns") has a sentence that says "A suggestion that public hearings on applications be limited to one every six months was taken under advisement by commission." That text is copied and from the article shown directly above.
In 1980, Ballmer, Allen and Gates are using an IBM PC XT and an AT. However, neither was available at that time. The PC was announced in 1981, the XT in 1983 and the AT in 1984.
When Apple demos their Apple II computers at the 1977 West Coast Computer Faire, they are shown using the Apple Monitor II green screen display, which was not introduced until 1983.
When the Microsoft team arrives at IBM to pitch them DOS (~1980), they are driving a 1985-1989 Dodge Aries K. In the shots after they leave, a CHMSL (3rd brake light) is visible, which were mandated for the 1987 model year.
In an early scene, where Woz and Jobs were chatting about the future (in Captain Crunch's bedroom or dorm room), there is a Star Trek poster hanging on the wall. The Enterprise shown is the earliest version from the original TV show, but the poster ("All I need to know about life I learned from Star Trek") was produced in the 1990s. The words above "Star Trek" have been trimmed off.
After John Sculley tells the group that someone needs to make a toast, as Steve Wozniac turns to Mike Markkula, the shadow of the camera is obvious across Mike's face, and it fades away when the camera backs up.
Microsoft's headquarters are located in Washington state. At one point in the movie when Bill, Steve, Paul and Charles are running through the airport to head to California to meet with Steve Jobs, you can see the LAX Theme Building of the Los Angeles International Airport in the background through some windows.
When Wozniak accidentally sets fire to his computer made from spare parts, just as the local newspaper arrives to cover the story, a brief shot of the newspaper article (Boy Laughs as Computer Burns) follows, part of the text states "Steve's freind Steve Jobs" - with 'friend' misspelled as 'freind'.
Every character mispronounces Mike Markkula's name, including Markkula himself. They pronounce it "mar-KOOL-ah," while it's actually pronounced "MARK-ah-lah."