Revealing mistake: During the shots of Phoebe and Frankenstein as the vortex is open, watch the kids by the church in the background; they just rock back and forth over the railing to give the impression they are fighting not to get pulled in.
The Monster Squad (1987)
1 revealing mistake - chronological order
Directed by: Fred Dekker
Starring: Stephen Macht, Andre Gower, Duncan Regehr, Robby Kiger
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.
Horace: Wolfman's got nards.
Question: What was the point of Dracula blowing up the clubhouse? He obviously knew the kids weren't there because he tells the father that he is going for his son.
Answer: It was in retaliation for them stealing the amulet from him. You can actually consider it the first shot of the impending battle between the monsters and the Squad.
Answer: He's pissed off at the kids.