At approximately 34:35 into the film, the time on the clock in the room suddenly changes from just after 2 o'clock to 3 o'clock. Then at approximately 37:00 it moves back to 2:05 and then to 2:09 as Dorian continues to play the piano.
When Dorian confronts Allen Campbell with the blackmail letter in his drawing room, Allen sits at the round table, which has only the cat statue and the letter on it. In the next shot there is a writing implement on the table as well.
Adrian's chalk sketch of Dorian Gray on the table changes from shot to shot.
When Dorian is watching the entertainer who resembles Buddha, the line which marks the separators in canvas behind the entertainer's head changes.
When Dorian tricks his butler into thinking he's arrived home late, his gloves are off and on between shots.
When Lord Henry first spots the butterfly on the drape in Basil's studio, the mesh edges of his fake beard are clearly visible.
Some of the characters grow physically older during the course of the tale while others do not.
Dorian and Henry travel on a train bearing the "LNER" lettering of the London and North Eastern Railway, which was formed in the 1920s.
Twenty years go by, bringing us to 1906, but there does not seem to be any updating of clothing or vehicles. Even at the end it still looks very much 1886.
When Sibyl Vane first catches sight of Dorian while she's performing "Goodbye, Little Yellow Bird," she momentarily stops singing, but her voice can still be heard on the soundtrack.
Toward the end of the movie Dorian and Henry arrive at Selby Station, Yorkshire, England. The train pulls into the "stationhouse" platform which is to the most right-hand side coming UP from London. It is clearly an American station. British trains run on the left-hand side.
When Dorian is riding the train early on, the scenery of the rear projection outside the train window changes from passing trees to open fields.