The album-wrap party takes place in a suite on an upper floor of the Chateau Marmont (we see Ian order more champagne for the "penthouse suite", and the view from the balcony is clearly an upper floor). Yet when Sam storms out of the suite, then runs downstairs while arguing with Jane, they only descend one flight before reaching the lobby. There is a cut, but the dialog implies that no time was cut from their descent.
On the plane, Sam and Alex ask for scotch and juice, respectively. The stewardess hands them a bottle (presumably of scotch), a glass of ice, and an empty glass.
Sam tells Alex that his patient had an ecstasy induced psychotic episode. Later, Sam says the patient had a psychotic episode because he OD'ed on methamphetamine.