Mme Alexandre is supposed to be Francophone (either French or Canadian) but Signe Hasso makes a British accent instead and sounds like Julie Andrews.
Cannon is shown to have a pistol range in his apartment. Both he and a friend are shown shooting their firearms there. Since Cannon is shown to live on an upper floor of a luxury apartment building this would not only logistically impossible to install such a setup, it likely would be illegal to use it.
Approximately 36 minutes in, light stands could be seen reflected on the door of the Thunderbird as it drives off.