When Number 5 is climbing down the fire escape ladder as he is talking to Klaus, he can be seen in the left edge of the screen jumping off the ladder. After a quick cut, there is a close up of Number 5 jumping off the same ladder a second time.
When Mom is making eggs, the four eggs in the frying pan mix together. When she serves them to Luther and Allison they are all separated.
Vanya (Ellen Page) plays violin, but the black case she carries is clearly a saxophone case.
This is revealed to be a violin case that is just shaped like that in Changes (2019).
This is revealed to be a violin case that is just shaped like that in Changes (2019).
Detective Patch describes Diego's outfit as Spandex, and he corrects her, saying it is leather. On close ups, the costume is actually made from knitted cloth.
At 32:27 The portrait of a lady that Mom/Grace admires is a famous 1823 painting by Ingres of Madame Jacques-Louis Leblanc that has hung in the Metropolitan Museum of Art for many decades. It measures about 3'x4' minus the frame. In the Umbrella Universe it appears to have both shrunk in size and to have been acquired by private collector Hargreeves. Otherwise, you could argue that this eccentric billionaire didn't mind hanging cheap reproductions on his walls.