When Amy is in her car following Luce who is on foot, she is travelling visibly quicker than he is yet never catches up or gets closer to him.
When Luce goes for a run he takes his shirt off and throws it on top of a box in his closet top left. When he returns from his run and his mom is in his room, the shirt is gone.
When Rose falls at the end of her "incident" at the high school, the woman who opens her arms to catch her is obviously a stunt woman well into her 30s there to enable a safe fall whilst naked.