The character which Hawks talks to on the video-phone at the beginning of the film is the robot from Fred Olen Ray's previous film, Star Hunter (1996).
4 minutes 30 seconds into the film, we see a brief shot of a city at night. The closest building, on the left hand side, is lit so that the windows spell out a phone number. It starts with 2622.
When Ford and Enwright are reading data from a port at the back of the assassin droid's neck, his head bent quite far down onto his chest. In the close-up of the back of his neck, his head is raised much further up as though he were sitting normally and awake.