Evolución

Initially written as a serious science-fiction thriller, Ivan Reitman hired David Diamond and David Weissman to re-write the project as a Los cazafantasmas (1984)-style comedy. The original writer, Don Jakoby, actually enjoyed the changes so much, he continued working on the film alongside the other writers.

In the opening sequence, when Wayne runs from the meteor about to hit the ground, he isn't wearing his fireman's jacket. When he is shown with his back to the camera looking at the explosion, he is wearing a jacket.

There is an item 'Stunt Primate'

In the courtroom scene, 'Julianne Moore (I)''s character's top pops open, flashing David Duchovny and contributing to her character's inherent clumsiness. This was later cut from the theatrical release, but remnants of its effect can be seen in the courtroom scene. At the beginning of the scene, the top button of her blouse is obviously stretching her blouse, and later we see her clutching her jacket over the open shirt. There is also an allusion to it later in the diner when Orlando Jones comments upon Duchovny's ex pulling off one of his old shirts, saying all the women he's met today have taken off their shirts in front of him.

Featured in Siskel & Ebert & the Movies: What's the Worst That Could Happen?/Pearl Harbor/The Anniversary Party/Stanley Kubrick: A Life in Pictures (2001)