Deliberate mistake: When the vortex is summoned to get rid of the monsters, other things get sucked into it. Cars, trees, light poles, other police officers. However other things or people who are more accessible do not get sucked in. For example, Phoebe hiding behind a bench, the bench itself, Phoebe's mother and a few cops hiding behind a cop car, etc.

The Monster Squad (1987)
1 deliberate mistake
Directed by: Fred Dekker
Starring: Stephen Macht, Andre Gower, Duncan Regehr, Robby Kiger
Continuity mistake: When Horace is confronted by the Gillman and has picked up the shotgun, he looks inside and sees E.J. and another kid hiding behind the counter. Horace begs them to let him in. E.J. and the other kid shake their heads no and lower themselves behind the counter. A few seconds later, a distant shot shows the two shaking their heads and lowering themselves behind the counter again.
Phoebe: Come on. Don't be chicken shit.
Trivia: To keep things "real" between Dracula and the kids, Duncan Regehr would not interact with the children in the film unless they were shooting a scene. He wouldn't speak to them, eat with them, or acknowledge them at all to keep a wall of distrust up with them. After the film wrapped, it was reported he treated them and their families to dinner to celebrate.
Question: How does the dog get into the tree house?
Chosen answer: Obviously it is carried up there by one of the kids.
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Answer: It's unknown how the dog got into the treehouse. After the boys put their hands on top of each others, the dog puts his paw on and Rudy questions how the dog got in with none of the boys being able to give an answer.