When the junkie girl blows up the house with built up gas from the stove, there is a flame showing lit in blue on one of the stove burners before she strikes the lighter; there would be no gas built up in the house... There would be no explosion.
The goof item below may give away important plot points.
Boom mic visible
(Approximateley 2/3 running time) After Viggo Mortensen's character kills in the parking lot, he drives off in the green T-Bird. The shot shows a boom in the background through the passenger window at the roof line.