"Whatever you think about the so-called crime, Polanski has served his time," Weinstein wrote.
Polanski took a deal and pleaded guilty to one count of unlawful sexual intercourse and served 42 days in a California jail where he was psychologically evaluated.
His Hollywood rep Jeff Berg told "GMA" Tuesday that Polanski fled to France in 1978 only after learning during a discussion with the district attorney outside a Los Angeles courtroom that the judge in his case was preparing to sentence him to more prison time and require his voluntary deportation.
Following the 2008 HBO documentary "Roman Polanski: Wanted and Desired," which raised questions about the case, Berg said Polanski's rights were violated and the case was "plagued with prosecutorial and judicial misconduct."
In the film, Wells, the former assistant district attorney, acknowledged having improper conversations with the judge, Laurence J. Rittenband, and advising him on sentencing Polanski. When asked about it, he told ABCNews.com he exaggerated such claims for the film to make himself look more important to the case than he was.
Wells did say he was being truthful when he told the filmmaker that he handed the judge's clerk a copy of a foreign newspaper with a photograph of Polanski with two young girls. Wells said the judge responded, "That son of a bitch is going to state prison."
Polanski fled the country before Rittenband could sentence him and Rittenband later recused himself from the case. He died 15 years ago.