Corrected entry: When Lexie is in her boss' office and lights up a cigarette, you can see that it has a filter on it. Filter cigarettes didn't come out till around 1936: the movie takes place in 1925. Just a side note: if you notice, she never actually smokes the cigarette either.
Leatherheads (2008)
1 corrected entry
Directed by: George Clooney
Starring: George Clooney, Renée Zellweger, John Krasinski, Craig S. Harper, David de Vries, Rick Forrester
Continuity mistake: When they are in the bar, Renée Zellweger's hands change place drastically depending on the angle.
Jimmy 'Dodge' Connelly: You're only as young as the woman you feel.
Correction: Cigarette filters were actually invented in 1925 by a Hungarian scientist, and filters were used on "elite" brands of cigarettes since then, and used on the majority of cigarettes by the 1960s. Most common brands of cigarettes took until the 1950s for filters to become commonplace, but filters were kind of "options" on cigarettes since they were invented.