The water level in Pauline's glass cup changes from very full to partly empty and back again when she is talking to Dr. Jakes in her room.
Theo confirms to Posy that she can smell the 'gas fires' in the ballet school. But in a later scene, Madame says that her office has the only heating in the school. This isn't possible if there are multiple gas fires.
The first time we see Theo teaching at the barre, she walks along the line of dancing girls, then instructs them all to turn about-face. We see them turn, but in the next shot they are still facing the same direction they were before they turned.
Dr. Jakes pours a drink for Pauline, straight from a boiling kettle. Pauline drinks it immediately, which in reality would burn her mouth.
Garnie tells Petrova that she is going to entirely replace the old worn out Christmas decorations with new ones. But the 'all new' decorations presented in the following scene are exactly the same as the old ones.
When Petrova is sat on Mr. Simpson's lap discussing moving house, a crew member holding a light reflector is visible in the glass display cabinet behind them.
In the Fossil girls' bedroom, when Pauline tells Petrova that Garnie is very worried about money, the shadow of the boom mic is visible moving across Pauline's hair.
When Theo tells Pauline and Petrova about their first audition, the moving shadow of the boom mic is visible on her cardigan.