- Awesome, Dear Boy: Once the T-X was established as female, the nouveau role of a female Terminator became incredibly coveted, with about 10,000 actresses auditioning for it.
- B-Team Sequel: To James Cameron's Terminator 2: Judgment Day. Cameron refused to return, saying he'd finished the story he set out to tell.
- Dawson Casting: Nick Stahl was actually 23 when playing 19-year-old John.
- Deleted Scene: There were a lot of them, including the notorious Sgt. Candy scene explaining the origin of the T-800 series. Most other deleted scenes hadn't been released, though.
- Disowned Adaptation: Again, this film is one of the three Terminator movies that is completely turned away by James Cameron after Terminator: Dark Fate's production. He personally did enjoy the movie a lot back in 2003 and his opinion stayed that way until Salvation arrived, then he changed his mind and he felt only his first two Terminator movies should be canon.
- Distanced from Current Events: Kate's fiancé was originally named Scott Peterson. However, during production, a real Scott Peterson murdered his pregnant wife, so the character was renamed Scott Mason. Despite this, he is still listed as Scott Peterson in the credits.
- Doing It for the Art: During the car chase, the T-X attempts to shake the T-850 from the crane's hook by smashing the crane through a building. The studio didn't want to shoot the scene because it was too expensive, so Arnold paid for it himself at a cost of $1.4 million.
- Dyeing for Your Art:
- Arnold Schwarzenegger worked out for six months, about three hours a day, before shooting started, by which time he said he had the exact same body weight and muscle measurements as he had 12 years previously while shooting the second film.
- Kristanna Loken put on 15 pounds of muscle to fit her role of the T-X. She also took a mime class to prepare for her part. Because her character has so few lines, she had to learn to communicate through facial expressions and body gestures.
- Flip-Flop of God: Although he admits that T3 isn't the direction he would have taken the films, James Cameron actually enjoyed the film. Considering what he had to say about another sequel to a movie of his, that's quite an accomplishment. But after the arrival of Terminator Salvation, however, he changed his mind and heavily criticized all the sequels after ''T2'', especially this film. As of Terminator: Dark Fate, he's also called this movie "a bad dream", so it's no surprise that Dark Fate ignores the events of Rise of the Machines and acts as the sequel to T2.
- Money, Dear Boy: Arnold Schwarzenegger initially refused to make Terminator 3 unless James Cameron directed it. In the end, $30 million (and reportedly Cameron himself) convinced him to make it anyway. As the Doing It for the Art and Dyeing for Your Art examples above indicate, he definitely earned his paycheck.
- Never Trust a Trailer: When the T-X is blasted through shutters and down a lift-shaft, the T-850 says, "She'll be back." In the trailer, he turned back from the shutters to say this. But in the movie, he said it while still peering down the shaft.
- The Other Darrin: Edward Furlong was originally supposed to reprise his role as John Connor, but he was dropped from the film, allegedly due to a substance abuse problem. Enter Nick Stahl.
- The Other Marty: Sophia Bush of One Tree Hill fame was originally cast as Kate Brewster but was replaced by Claire Danes a week later as Jonathan Mostow felt that she was too young for the role.
- Permanent Placeholder: After the funeral battle, when the T-X scans its damaged weapons arm, the diagnostics text is an obvious placeholder (and reused for all of the weapons!). Click to read.
- Technology Marches On: Cruelly used in the last few minutes. After the heroes arrive to blow up Skynet's mainframe, they discover that due to all the changes they've made to the timeline in previous films, this current iteration of Skynet is actually a distributed computing network spread all throughout the Internet and thus impossible to destroy, just as its military creators intended.
- What Could Have Been: See the franchise's page.
- The Wiki Rule: The Terminator Wiki.
Trivia / Terminator 3: Rise of the Machines