During the fight scene at the warehouse when Demona is trying to steal the chemical, Demona is seen shooting a laser/plasma gun at a red van which Broadway is hiding behind. The gun's discharge easily shoots through both sides of the van. However, when Brooklyn rips off the car door that he was behind and charges Demona, her blasts have no effect whatsoever though both vehicles would have been made with the same material since both are average, everyday vehicles.
When Elisa performs CPR on Angela she does a 1 breath to 4 compression cycle. CPR protocol in the mid 90s for a solo rescuer was 2 breaths to 15 compressions (1 breath to 5 compressions if two rescuers are working together). As a police officer, Elisa would have known this.
In 1495 Florence, Demona says "Revenge is indeed a dish best served cold." But that phrase wasn't coined until the 18th century: "La vengeance est un plat qui se mange froide" from Pierre Choderlos de Laclos's Les Liaisons Dangereuses, 1782 (which novel has been adapted as Dangerous Liaisons (1988) and Cruel Intentions (1999)).