Even if the spinning top did topple over, it wouldn't mean that he wasn't dreaming. Why? Because he told Ariadne his secret to knowing what was a dream and what wasn't. Cobb always said you should never tell someone that secret.
You missed the key words - the top was his wife's totem, not his. As you say, you're not supposed to tell anyone what your totem does, so as others can't dream it, yet he tells Ariadne exactly what the top is supposed to do. Because it wasn't his.
His own totem was never revealed, or was it... Right at the end, literally - his kids' faces, revealed. When he sees them, his face lights up because he knows he's not dreaming any more. So he makes it back to reality.
When he's showing Ariadne his kids in the garden, he says that whatever he does he 'can't change this moment' and he'll ony see their faces when he gets back to reality, so he's as good as saying he's in a never-ending dream and they are his totem.
He spins the top on a couple of occassions I reckon to see if it's still *her* dream he's in, a dream within a dream, ie after she stabs Ariadne on the bridge for instance, or right at the end too. The spinning at the end is a red herring because it cuts to the credits exactly where it starts wobbling.
My rating: overall, more interesting to analyze afterwards than actually watch it.
PS. Then again, how can he relive that moment and have a different outcome where he sees his kids' faces? Must still be a dream...
😀
Near the beginning, when Saito was in the helicopter (which happens in reality)
I disagree. The scene immediately preceding it down in the hotel room before he goes up to the helipad, while he speaks to his kids on the phone = he spins his wife's top and it eventually topples - so not her dream. But we see flashes of his kids running from the garden without seeing their faces - so still his own dream.
Ergo, the whole movie is a dream except for waking up on the plane and going home at the end. Maybe even that too... The helicopter scene jumps like the rest of it, one second he's standing on the tarmac, the next breath they're both sitting inside the helicopter and it's airborne. Either it's a dream or it's really bad directing/editing!
😉