During the fight scenes, the camera often tracks Grey so that he remains in the middle of frame. According to director Leigh Whannell, this was achieved by hiding a phone somewhere on actor Logan Marshall-Green, which the cameras could then pair to and follow with as much accuracy as possible.
At one point during the hacker building sequence, the Saw (2004) doll can be seen painted on one of the walls. Leigh Whannell, the director for this movie, also wrote the first Saw (2004) feature film screenplay.
The film was originally titled "STEM," which the website Movie Insider credits as a separate movie from Upgrade that Whannell will eventually make.
When Grey is entering the apartment block to find "Jamie", he pauses at some apartment buzzers. One of them says "J. Wan" - James Wan has been Leigh Whannell's main collaborator since the first "Saw (2004)" film.