Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Q: So, this question is not really about the series the Mentalist, but I think it fits here anyway. First, I am not from US, so I dont know if CBI really exists or was made up only for the series. In the series Wayne Rigsby and Grace van Pelt have an hidden relationship because it is not allowed at CBI. Everybody warns them to keep it a secret, because otherwise that would have consequences and one of them would have to leave the CBI. Is this really a rule at CBI or similar American criminal bureaus? What is the reason for this rule? In Europe I have never heard of such a rule, as far as I know relationships are not forbidden here when working together in a police-like environment.

A: Is it forbidden to have a relationship in CBI in reality?
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Q: In the first Matrix movie Agent Smith and Neo survived the green explosion from inside the agent. But in the third movie Neo and Smith both died as a result of the same attack in the first movie. How did this happen?

A: If Neo survived in the first movie, how come he didn't in the third movie?
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Q: Although there is no disputing the impact that Steven Spielberg's Jurassic Park had when it was released in 1992, there has always been one scene that has bugged/perplexed me. I speak of the climax, when Alan Grant et al are surrounded by the Velociraptors and about to be pounced upon, when suddenly the T-Rex lunges in and 'saves the day'. It has already been established earlier on the film that the T-Rex telegraphs its approach with thunderous footsteps, and I'm pretty sure that even if the humans were surrounded by malevolent reptiles, they would notice a huge T-rex squeezing in through the front door of the reception center. Possible explanations include the T-Rex's ambushing skills (as evident in the earlier Gallimimus chasing scene), the afore-mentioned distraction of the Velociraptors, or even a huge suspension of disbelief to better serve the dynamism of the scene. I don't like the idea of T-Rex just being shoehorned into the scene to add some va va voom, so is there a better explanation?

A:
Where did the T-Rex come from?
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