This is the second character named Olivia that Juliet Holland-Rose has played on a Disney show; the first, on Phil of the Future, was better known as Via.
At the stunt event, when Zeke tells everyone to hold on, we see a woman in a pink top and blue overalls turn to look. She's standing and not wearing sunglasses. In the next shot, we see her in the background sitting down with sunglasses on.
When Syd is tweaking Luther's neck, a dirty white rag magically appears on the television behind them.