Plot hole: When Dana realizes that the puppeteers made them choose their own deaths (while standing in front of Fornicus in the elevator) she does so by watching the puzzle ball he holds. But she never saw the puzzle ball back in the cellar. Only Curt handled it briefly and is shown approaching her without it when she starts reading the diary.
The Cabin in the Woods (2012)
Plot summary
Directed by: Drew Goddard
Starring: Chris Hemsworth, Anna Hutchison, Kristen Connolly, Fran Kranz
Five friends go to a secluded cabin for a weekend of fun. Little do they know their every move is being watched and manipulated. As they start to get picked off one by one, the survivors must band together to discover the secret behind the cabin in the woods.
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Trivia: Actual "Cannabis Experts" were brought in to consult with actor Fran Kranz, so he could properly portray a convincing stoner in the film.
More questions & answers from The Cabin in the Woods
Answer: It's stated that the tunnel should have blown hours ago, so the initial failure is most likely human error, that the order to blow the tunnel simply didn't get through to the demolition team on schedule. The subsequent problem blowing it up is referred to as being related to "a glitch up top", later stated as a "power re-route upstairs". While not stated outright, the only plausible explanation is that this was, as you rightly stated, due to Marty messing around with the equipment that he found in the hatch.
Tailkinker ★