Madeline is seen at her home drinking prosecco out of a particular yellow mug depicting a palm tree. Later she goes to visit the model at her house and is seen drinking tea out of the same mug.
Jonathan and Maddy are fixated on the idea that if Serena Shale committed the murder they must break her alibi. But they don't consider that she could have hired someone to murder her husband.
The police inspector investigating the scene of crime flouts all standard procedure by entering the garden without wearing special clothing to prevent contamination and picking up the pouch containing the jewelry without using gloves.
When Madeline Magellan is trying to tap into someone's answer machine she says "BT use a two digit code, that's 99 possibilities" There are 100 possibilities though. 00 through 99.
The character of Francesca is supposed to be a French model, but the actress speaks with a Dutch accent throughout, with no attempt at a French accent.