I like the part at around 1:50 when she just holds the bike stationary and the audience is waiting her to do something, before realizing that that is the trick, then gives her an applause and releases her to do another trick. Or maybe I misread the situation
That standing trick around 3 minutes, we used to do that with my mates when we were kids, it's not that hard. First you just kind of "skate" on the bike by placing your feet on the crossbar, and as you gain confidence slowly move upwards.
I like old videos, they appear so sweet and innocent, like people are more authentic or something