Factual error: At the end of the film, when Duchovny and Jones are on the ladder truck shooting the head and shoulders, they are yelling "go go go". They slide down the ladder and the next shot is the fire truck speeding away. Movie elapsed time 5 seconds. It is a physical impossibility for a fully extended ladder to be lowered, retracted and bedded in a span of less than 4-7 minutes. Even if the hydraulic lines are cut, the ladder would remain upright and not collapse/retract. (01:32:59)
Factual error: The aliens are supposedly nitrogen-based, making them vulnerable to selenium in the same way humans are vulnerable to arsenic because we're carbon-based. However, nitrogen atoms don't have the valence real estate to form the long molecular chains critical to the DNA structure shared by terrestrial and alien life (when Ira first analyzes the sample, he finds DNA with 10 base pairs). (01:20:30)
Factual error: Ira says the aliens have 10 base pairs in their DNA and humans have 4 base pairs. Humans have four bases in their DNA, not 4 base pairs (we have over 3 billion base pairs). Not a mistake a biologist would make.
Continuity mistake: During the scene in the mall when the girl is in the dressing room, she keeps putting on more layers of clothing. But as they are shooting different shots she will have a hot pink shirt on, then it is back on the hanger, and then back on again. It switches back and forth many times. (01:00:50)
Trivia: "Evolution" was originally written as a serious sci-fi thriller by writer Don Jakoby. When Ivan Reitman signed on to direct, he felt the concept would make for a good ensemble comedy, similar to his film "Ghostbusters." Jakoby actually liked the idea of reworking the film into a comedy so much, he stayed with the project and assisted in re-writes.
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