Trivia / Upgrade

• Acting for Two: Logan Marshall-Green plays both Grey Trace, and Stem after taking over his body.
• California Doubling: Various road signs are seen that are in the U.S. style, and the cars have the driver on the left-hand side. However, some shots early in the film clearly show Melbourne's Bolte Bridge.
• Creator Cameo: Of a sort: Billy the Puppet appears as a piece of graffiti in the Hacker Cave.
• Creator Thumbprint: Leigh Whannell retains his use of big Once More, with Clarity-style reveals from the Saw franchise.
• Life Imitates Art: The method used in the film to bypass spine injury and give the user his legs back is becoming real, having been successfully used in humans by Swiss scientists in 2022 (but without the help of AI of questionable morality, fortunately).
• Working Title: As is evident by looking at the original script, the film's first title was STEM.
• What Could Have Been: Very early in this film's production, Greg McLean was set to direct.