A plaque to Harper says he passed away in 2016 but vehicle number plates quite clearly show some of them to be registered more recently than that.
At 9.22, a warning message says all elevators are suspended. The term lift is used in the UK.
At 2.55, a security person can be seen with the word Marshal on the back of their hi viz. Marshall, is the British English spelling of the word.
At 9.22, a warning message says all elevators are suspended but, at 17.12, when Marcus and Louisa are searching the Glasshouse for Pashkin, an elevator can be seen moving up in the background. All elevators are supposed to be locked because of the evacuation alarm.