When Ella is cutting Zander's brake cable on his mountain bike, she is holding the cable for the front wheel brake. When the scene changes to her actually cutting the cable, she cuts the cable for the rear wheel brake. When the scene changes again, she is back at the front wheel.
A girl that small wouldn't be able to knock a heavy-weight, grown man off a ladder.
Ella empties two detergent pods into an ice cream containers, stirs it in, then watches as an older woman eats the ice cream. Wouldn't the woman have noticed the difference in taste after one spoonful?