Her Alibi (1989)
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Blackwood and Nina have sex in a house that was destroyed by an explosion earlier in the film. This mistake was so notable it was mentioned in Leonard Maltin's review of the film:
"For a full appreciation of just how much contempt "Her Alibi" has for the audience, reflect for a moment on the movie's last scene, in which Blackwood and Nina are back in the snug Connecticut farmhouse for a big love scene and a fade out. The people who made this movie apparently actually forgot that they blew the house up a half-hour earlier."