While the majority of the book takes place in the 1830s, director Cary Fukunaga changed the time-line so that most of the film takes place about a decade later, because he felt that mid-1830s fashions were very over-the-top and unflattering, and wanted to dress Mrs. Reed in those styles rather than Jane Eyre.
The location of Jane's cottage was so isolated that there was no cell phone reception. A member of the crew had to be stationed in a nearby phone booth with a walkie talkie in case the crew needed anything - he didn't complain, however, as the local residents brought him tea and cookies throughout the day.
During the first meeting between Mrs Fairfax, Mr Rochester and Jane Eyre; Mrs Fairfax serves tea and then sits down with her cup. The cup she is holding is clearly empty.
The teacup that Jane is drinking out of is Belleek. Belleek porcelain was first produced in 1863 and was not widely available outside Ireland until the mid-1860s while the blue mark on Jane's cup was first used in 1993.
When Jane comes back from visiting her aunt, Mr. Rochester is sitting on the corner of the stone stairs writing in his journal. He puts the journal down next to him, and hops down to greet Jane. As she climbs the steps, the camera view shows the journal, but when the view of the camera turns to face him the journal has disappeared. Then reappearing when the camera is back on her.
You can check the Jane Eyre character page here: http://www.imdb.com/character/ch0017725/1943: Joan Fontaine1970: Susannah York (Nominated Primetime Emmy Awards 1972)1973(tv mini serie): Sorcha Cusack1983(tv mini serie): Zelah Clarke1996: Anna Paquin1997: Samantha Morton2006(tv mini serie): Ruth Wilson