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The original was posted on /r/todayilearned by /u/tyrion2024 on 2025-02-23 16:56:35+00:00.
Original Title: TIL as Spielberg was filming Jurassic Park’s climatic scene as originally scripted (with the velociraptors defeated by Dr. Alan Grant & John Hammond), he had the last-minute idea to bring back the T-Rex for the climax. As an “off-the-cuff thing”, the physical effects had to be setup in about 24 hrs.
Rushed it. That’s probably why there is a massive mistake in the climax. Earlier before we see the T-REX, its presence was felt with massive shakes on the ground due to its weight and in the climax, T-REX somehow went stealth mode.