Factual error: Right before Frank humiliates Dorothy for the first time, he blows out one of the gaslights in her apartment. That is never done in real life, for the same reason you would not blow out the pilot in your stove.
Blue Velvet (1986)
Plot summary
Directed by: David Lynch
Starring: Dennis Hopper, Laura Dern, Kyle MacLachlan, Isabella Rossellini
Returning home to visit his father who is in intensive care at the hospital, Jeffrey Beaumont (Kyle MacLachlan) stumbles upon a human ear he finds in a field. With local police detective Williams and the local police department unable to investigate, Jeffrey and Sandy (Laura Dern), Detective Williams's daughter decide to do their own investigation. But what Jeffrey and Sandy's investigation leads them to discover that a dark underworld exists in their hometown. Jeffrey becomes suspicious of nightclub singer Dorothy Vallens (Isabella Rossellini), who is involved with Frank Booth (Dennis Hopper), a violent and evil man.
More mistakes in Blue Velvet
Sandy: I don't know if you're a detective or a pervert.
Jeffrey: Well, that's for me to know and you to find out.
Question: At the end, when Jefferey shoots Frank in the forehead, the film editing becomes confusing, with two different closeup shots of Frank immediately after the gunfire. One shot is obviously Dennis Hopper with a wide-eyed and shocked expression (as well a hole in his head) as he falls backwards. But the following split-second closeup shot is apparently not Dennis Hopper: He now has what looks like facial hair, a sullen expression, larger brow and eyes that seem almost swollen shut (and he's still falling backwards). This second cut looks like a rubber mask or very, very different makeup from that which Dennis Hopper was wearing just a fraction of a second before. The appearance is so different that I wonder if David Lynch was ever asked to explain the continuity error?