Factual error: When Olive is repeatedly saying "I can't find it," Mr and Mrs Briggs are listening through the walls of their bedroom. However, we can see when Jack and Stan return with the toilet that Mr and Mrs Briggs are staying in the chalet to the right of the Butlers. When Stan first shows the family their chalet, it shows that their bedrooms are on the left. This means they wouldn't have been able to listen to Arthur and Olive through the wall.
Factual error: The oil "drill" is actually an oil rig, meant to pump oil, not drill for it.
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)
Factual error: When the pimp murders the hooker in the taxi, he is said to have forced drain cleaner down her throat. However, he uses an aerosol can. You can even hear the metal ball shaking inside of it several times. In the 1970s, drain cleaner did come in metal cans, but what he is using is a spray can of some kind, which drain cleaner did not come in. It is always in liquid form to pour down a drain, spray would not release enough.