- 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.
- What Could Have Been: Very early in this film's production, Greg McLean was set to direct.
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