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The vast majority of that expenditure was introduction of a hire bike scheme, replacing the "bendy buses", and figuring out what to do with the Olympic stadium. None of which I particularly disagree with.
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The hire bike scheme was far too expensive and the allegation is that Johnson was quite unnecessarily giving a lot of money to his privatised cronies at Serco.
Edit: Forgot about articulated buses. I could well imagine that if Johnson hadn't been so useless and hands-off, he might even have made a go of that, but he lost on all significant points of resemblance to the old Routemasters, and the resulting product was a bus that isn't loved at all (I think that's actually only because it doesn't have a loveable 'face' like the old ones) and doesn't perform particularly well (problems with air-conditioning are well-documented, although I can't imagine that they can't be solved; the biggest problem is with the engines).
I always liked Routemasters, too, but by the time Johnson took office the time for a policy he nicked out of Livingstone's 2000 programme had well and truly passed. Livingstone didn't deliver on it (and on its sister policy, of keeping conductors on buses) for several reasons, not the least of which was that his powers as Mayor were insufficient to finance the development of a good new bus (see his long dispute with Gordon Brown over Tube privatisation), which didn't hold Johnson back. It was a classic example of a manifesto promise that hadn't been thought through.
I haven't studied the Olympic Stadium process in any detail, but I'm sure there's a well-informed breakdown of it somewhere, quite possibly in Hodge's report.
Oliver Schick
There are all sorts of untold secrets about Johnson that if they got into the public domain would see him off immediately. He's a major scandal-in-waiting. (Not that he isn't already, if you know what I mean.)
https://www.theguardian.com/commentisfree/2017/aug/22/boris-johnson-940-million-system-to-blame