I concur with everyone else, really very well put together indeed. Real characters, plenty of action, good dialogue with memorable lines, plus some visual stuff to keep us amused. As Lazzard says, we're left to do some of the work, which is great.
I don't think it's too complex, I reckon it would be obvious on screen. My only concern with the flashbacks is imagining all the potential volume changes on the Smiths backing music. But lose Moz, not the flashbacks, if the case is called!
I also wonder whether leaving the change on the bus floor is quite right with the character & situation...as I'm imagining from what you've posted, of course, if you feel it makes sense, you know better than I!
One other tiny note: Is The Lemonheads a bit retro for a 20 year old? They wouldn't have been born when the band was having its hits, but they also haven;t really outlasted their era as a classic band (or have they??).
I like the opening scene, and think it should be there. The only thing that I think is that "It's a repeat" is the end of the scene, it's v funny. But then, perhaps I'm thinking in sit com terms, and this isn't a sit com. I have to say I feel that dramedies and things that "fall betwen two stools" generally frustrate me, but that's my taste, not a critiscism on what you've written.