Continuity mistake: When Hal and Catherine are arguing before she goes to the airport, her ponytail switches between going over the front of her shoulder and hanging straight down her back between shots.
Proof (2005)
1 continuity mistake - chronological order
Directed by: John Madden
Starring: Anthony Hopkins, Gwyneth Paltrow, Jake Gyllenhaal, Hope Davis, Danny McCarthy
Continuity mistake: When Hal and Catherine are arguing before she goes to the airport, her ponytail switches between going over the front of her shoulder and hanging straight down her back between shots.