When Elizabeth goes for a drive in the park, she goes to a conservatory. There is one in Kew Gardens in London but this is not a park and is a long way from Wimpole Street. She would be much more likely to go to Hyde Park or Regents Park, neither of which have conservatories.
When the Barrett children are gathered around the piano listening to Elizabeth sing, one of the sons can be caught looking directly into the camera lens, and then trying to divert his look.
The beginning of the film is set in 1845, but in the first scene Henrietta is shown singing 'Little Brown Jug', which wasn't written until 1869.