Wayne wakes up in room full of gas then the phone rings which he then answers. This is the worst thing you can do as slightest spark will explode gas. As phones were analogue and have electrical charge in them they will provide spark. So to have such a factual mistake is unforgivable error.
The morning after the explosion at the dance studio, the Harts, Max and Maureen are talking about Wayne's condition. Jonathan says that it's "unstable but he's still conscious." He should have said, "stable but he's still unconscious."
Jonathan says to Jennifer "Get your shoes on!" after he hung up the phone from calling a distressed Wayne. However, Jennifer makes no move to put shoes on, she simply gets up and leaves, with shoes on.