The phone number given is 555-9400. This is an American style number and not a British style.
When Brett is drilling the handcuffs off, he is using a masonry bit on steel when he should be using a HSS bit.
During the car chase, when Prue, driving the convertible, is seen from behind, her long blonde hair is streaming in the wind - however, in the close-ups of her face, not so.
When Brett is bundled into a red car by kidnappers the window in the car door reflects the crew.