It seems that this is all about credit. Lane told EW that she was never promised a particular title for her work, but was disappointed that when the credits rolled she was credited as a "Hand Model," "Stunt Double," and "Lady in the Lane."
She also said she was told by a producer not to talk to the press.
The filmmakers at Fox Searchlight challenged Lane's assertions in statement released over the weekend.
"We were fortunate to have Sarah there to cover the more complicated dance sequences and we have nothing but praise for the hard work she did," the statement said. "However, Natalie herself did most of the dancing featured in the film."
Fox has also removed a digitally enhanced version of a cut of the movie from YouTube that EW called an "unverified version" of a clip reel of the movie, reportedly showing how digital replacement was used to put Portman's head on Lane's body.
Of course part of the mirage of the movie experience is one where we probably don't want an intrusive "Warning: You Are Now Watching a Body Double" crawl on the bottom of the film screen.
But it appears as if it's a bigger deal when it's a dancing double as opposed to a singing double, as famously used by Natalie Wood in "West Side Story" or Audrey Hepburn in "My Fair Lady."
The nasty post-Oscar battle between Portman and Lane, over who did what on the "Black Swan" dance floor is a flashback to the 1983 dance blockbuster "Flashdance," which was panned by critics but a box office smash.
During the "Flashdance" debacle we heard a similar back and forth.
Jennifer Beals dance double, Marine Jahan, told "Entertainment Tonight" that producers hid her involvement because "they didn't want to break the magic of the film."
Jahan, like Lane, was also unhappy that her name wasn't in the credits.
According to a report in the Los Angeles Times, the filmmakers responded by saying that Beals "would be the first to admit some of the more complicated turns would have to be doubled," adding that expert stand-ins for dancing are "very common."
The "Flashdance" dance double controversy didn't affect sales at the box office back in the day, and the feud with Lane over "Black Swan" will likely boost sales of the DVD, which, conveniently, comes out on today.