Right at the start of the film, a dog has been run over by a
car. To put it out of its misery, Ivy kills it. As she does, a whole lot of blood splashes on to Sara's face. However, in the next shot, the blood is nowhere to be seen.
(at around 1 min) During the party, Ivy has served Darryl Cooper a glass of champagne. He raises it to his mouth with his left hand to take a sip. The camera then changes to his point of view. Having taken the sip he gestures to Ivy with the champagne glass in his right hand.
In the scene where Sylvie breaks the espresso machine, spilling coffee grounds on the floor; the maid, Iris, uses the vacuum to clean it up. We hear a vacuum sound effect, and the camera focuses on the machine but the vacuum is clearly not turned on because the vacuum bag does not inflate.