When a beautiful stranger leads computer hacker Neo to a forbidding underworld, he discovers the shocking truth--the life he knows is the elaborate deception of an evil cyber-intelligence.
The bomb used in the elevator used a redundant pair of mercury switches. They are triggered by movement, which causes the mercury to touch a pair of contacts, completing an electrical circuit. These are also referred to in Lethal Weapon (1987).
When the bomb is detonated at the bottom of the elevator shaft the lobby is shown to be in pristine condition immediately before the explosion. However, the lobby should be in shambles due to the previous shoot-out. This is most noticeable when looking at the pillars after the shoot-out and during the explosion.
After the lobby shootout, Neo and Trinity climb on top of the elevator car and clamp onto the lift cable. Neo then severs the cable from the elevator car, the car falls back to the lobby where the bomb explodes, and Neo/Trinity are hauled upwards by the counterweight. In actuality, because of the Otis safety brake, severing the cable would have resulted in the car locking in place in the shaft, never falling, and the bomb not detonating where intended.
The bomb used in the elevator uses mercury switches. While the glass vials with the mercury look cool on camera, this would not have been the best choice, as the mercury could touch the contacts during the fall, causing a premature explosion.
When the falling elevator creates a fireball at the bottom of the shaft, the agents on a high floor get doused by the fire alarm. This is not how fire sprinklers work - they are activated where heat or fire are detected, not in unaffected areas.
Keanu Reeves as Thomas Anderson/Neo
Laurence Fishburne as Morpheus
Carrie-Anne Moss as Trinity
Hugo Weaving as Agent Smith
Joe Pantoliano as Cypher
Marcus Chong as Tank
Anthony Ray Parker as Dozer
Julian Arahanga as Apoc
Matt Doran as Mouse
Gloria Foster as The Oracle
Belinda McClory as Switch
Paul Goddard as Agent Brown
Robert Taylor as Agent Jones
Ada Nicodemou as DuJour