Plot hole: In order to get rid of the monsters, Phoebe needs to read a text from Van Helsing's diary in order to summon the vortex. As Dracula approaches her, she becomes scared and misses on some words (the Scary German Guy is helping her read since she is 5 years old and she doesn't repeat some of the words he says). However the vortex still shows up to get rid of the monsters.
BaconIsMyBFF
22nd Feb 2007
The Monster Squad (1987)
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Suggested correction: It is never specified that the incantation must be read verbatim to work.
It also never states that reading only part of the incantation would work either. However, the mistake is still valid because the way to get rid of something evil by reading some "spell" you'd have to read the entire thing. Therefore the virgin shouldn't have been able to summon the vortex.
Since "spells" are entirely made up and magic isn't real, you can't say that in this film every word must be read for it to work when the film itself shows otherwise. Every film gets to make it's own rules with magic, this film establishes that the incantation can be read "in spirit" to work. Other films might have different rules.
It's always been implied in movies and books that incantations must be read word for word in order to work. Otherwise, what's the point of having all the words there if you only need to read a word or 2?