Factual error: While Sgt Howie (dressed as Punch) is being chased by the women, you can see autumn leaves on the grass, though the story is set on the 1st of May.
Factual error: When Thorn is outside of the Exchange talking to the Hatcher on the phone, he sees people coming for him. He tells him, "Hatcher, help me," climbs some steps, then drops the phone. It was just the handset of a phone without the cord to look futuristic. Anyway, the phone makes a ringing sound when it hits the ground as if an entire desktop phone had been dropped. Dropping the handset wouldn't make that sound since the bell is in the base unit. (01:02:19 - 01:28:33)