Earlier quoted context omitted.
As noted in the post, iOS devices will only do video tags fullscreen.
I just tried on my friend's iPod and the animation doesn't play there anyway (it just stays on the "lock" image). Maybe the iPod browser is different (my Android doesn't play the animation either) but I'd be surprised if the animation worked on an iPhone but not on an iPod...
Apple's JS disables the animation for iOS 4.x and below, so maybe that's why it wasn't playing on your friend's iPod.