While Grace is searching for the missing curtains, Anne and Nicholas argue while Anne draws. Her drawing goes back and forth, being less complete when the camera is beside her, and more complete when it is beside Nicholas.
Grace is teaching the children and tells them that they must study separately from their readers. Anne leaves to go into the music room and the door is locked but the camera stays with Nicholas in his room. He begins to read from his reader and the camera dollies around behind Nicholas and on the table you can see Anne's reader. In the next shot, Anne is in the music room with her reader.
When Grace is eagerly trying to conceal her children from the sunlight, she takes them to a room located in a narrow corridor decorated with pictures and a statue of the Virgin, near their bedroom. Grace opens the door into the room but, when we see out to the corridor from inside the room, the pictures are gone, the wallpaper has different pattern and color, and there is an electric lighting fixture on the wall not previously seen.
Grace says the house does not have electricity. However, when Anne is standing and reciting to her mother as punishment, the table to the left of Anne has a statue of a horse on it which is clearly backlit by the white light of an electric bulb. In the following shots as Anne and Grace argue about Anne's forgiveness, the light is gone.
Near the end of the movie when Anna and Nicholas are walking away from the house they are moving away from it and this is clarified by Anna's line "We're not at the end of the garden yet" but when they stand before the grave stones a few shots afterwards, the house is behind the graves. We know for earlier on when Grace has been talking to the gardener that the graves are near the end of the garden.
It is mentioned that the photo album is a book of the dead, photos taken of those who passed on so they can live on through the photograph. The discussion makes it seem as if this was something done by superstitious people, but that's not necessarily true. During Victorian times, photos were costly and many people could not afford them. This is why photos were taken after the person died as it was, inevitably, the only photo ever taken of that person. They even went so far as to create devices to hold the corpse in an upright position so they could appear to be standing (you can sometimes see the base of them in the photos). Pupils were often painted onto the closed eyes after developing and occasionally a hint of pink was added to the cheeks to make the person appear more "alive". There are many websites devoted to the history of this practice.
Grace believes her children cannot be exposed to ANY daylight and seems to be constantly vigilant about it. When Anne comes out of the bedroom after talking to her father, the curtains are very obviously pulled open with lots of light coming in yet she acts like it is nothing unusual.
When Anne and Nicholas figure out that the servants are dead, and Nicholas runs away from their approach, catching up to Anne they both run past the strange tree behind the head stone. As they run past it's obviously a prop tree as the trunk of it wasn't fully buried leaving a strange-looking base around it while on even ground.