When Ezra and Maddie/Saffron/Ava are dancing at the birthday party, the position of her hands changes back and forth from shot to shot.
While the series is shot in Vancouver BC with shots of Seattle woven in, there are shots of downtown that have red fire hydrants. Seattle hydrants are green. The parking meters are wrong as well. Seattle uses a pay to park system where you go to a central kiosk on the block to pay and it issues a receipt.
Immediately after Patrick places the tracker in Maddie's pick-up the map shown is of London, England
The Red tracker actually moves along Burlington Gardens towards New Bond Street outside the Ralph Lauren store just off Piccadilly.
Richard follows Patrick and the highway sign says Seattle. But the building they arrive at is 1075 W Georgia Street, Vancouver, Canada. The scene depicts a US agency which isn't going to be in Vancouver.