Regency manners misunderstood. At the formal dinner where Lady Catherine quizzes Lizzie, the only "correct" conversation undertaken by the diners would have been to the person directly beside one. Usually half of the dinner conversing to one side, and then the remainder to the other. It would have been extremely inelegant for Lady Catherine to have addressed all the diners.
When Mrs. Bennet's sister comes, delivering Jane from London, Kitty comes into the room crying. When Mrs. Bennet's sister says, "They probably can't afford it," her mouth is still moving after the line has ended.
At the beginning of the film, the Sun is on one side of the house, Lizzie walks from the rear to towards the front of the house, the camera enters a doorway to show Mary playing inside Longbourn, the Sun is low in the sky from the other side of the house. The scene has been filmed as a continuous shot but it is impossible for the Sun to have moved. In the commentary the director explains that the scene was cut as Lizzie passes behind some laundry - not "to indicate a passing of time" - but because he wanted to use the Sun from both sides of the house. He hoped the audience would "not notice the two Suns". It is a goof but it was intentionally done to make filming easier.
Elizabeth Bennett is sitting in a swing that is suspended from the rafters in a drive-through barn. The ground all around her is a sea of mud. No boots or shoes are visible anyplace. The scene shows her barefoot with her legs stretched out and her feet quite clean.
When Lizzie is at Pemberley and hears Georgiana playing the pianoforte, she walks by an area with red-and-gold wallpaper, an enormous painting, and a table sitting on a light-colored carpet. She peeks through the door to see Georgiana reflected in a mirror playing the pianoforte. When Lizzie and family come to dine the next day, the pianoforte has been moved to that same room with the distinctive painting, wallpaper, and carpet.
In the Netherfield Hall ballroom scene, Mary is seen behind Mr. Collins when Mr. Collins loudly introduces himself to Mr. Darcy; she is then immediately heard playing the piano in the next room. The scene of Caroline & Lizzie observing and commenting on the manners of Mr. Collins is simultaneous with the Collins/Darcy scene; therefore it is impossible for Mary to be also heard singing at this time from another room into which Lizzie then walks. The director's comments about a montage of the events that occur at the ball, cannot rule this out as a goof.
Early in the film Darcy assists Elizabeth into the carriage with this right hand. Afterwards the camera zooms onto this hand to show the effect that this 'first touch' has upon him. In a much later part of the film when Darcy wants to touch her again, but cannot, the camera zooms on this hand again. This time, however, it is his left hand.
During the ballroom scene, when Lizzie and Charlotte bump into Mr Darcy and he asks Lizzie to dance with him, if you turn the volume up you can hear the crew members discussing the position of the boom in the background.
When Mrs. Bennet follows Elizabeth out to the pond after Elizabeth's refusal of Mr. Collins, Mrs. Bennet's audio cord can be seen stretched out from under her dress. It is masked with foliage, but still clearly visible.
Mr Bennett first appears holding a plant, an orchid. Given this flower was still very rare in England when the book was written (mid 1790's) and the majority of known orchid plants were grown at Kew Gardens hot houses, the few specimens that were in public circulation were in the hands of the very wealthy. It is therefore unlikely that Mr Bennett would have access to this particular plant.
While sitting in the woods "quite close to" Mr Darcy's house with her Aunt and Uncle, Lizzie is wearing a dark brown dress with a lighter colored coat. But when they go to see the house, Lizzie's dress has changed to a cream striped dress with the same coat as before. In the book the party of 3 decide to visit Pemberley the following day. In this film the changing of the dress and the fact that they clearly arrive at Pemberly in the early morning are supposed to indicate albeit rather subtly that it is the following day without having written it into the script.
When Elizabeth examines the bust of Mr. Darcy, the camera pans around the back of the bust and dried dollops of plaster can be clearly seen on the backside of the shoulders and the column. The bust is supposed to be carved marble, and would not have the plaster dollops.