The guy screaming right along with them at 4:39
I like how Lauren stayed true to the original vocal arrangement without stretching the words, or holding notes.
Ally looks really good in the middle! It balances it out, because she looks awkward when she's off to the side. (And plus I hope they've learned to never ever let Ally and Dinah stand/dance/sing/be/co-exist/breathe side by side on stage
)