
The hotel - Arthur (Joseph Gordon Levitt) dreams the hotel, which is why he has to stay awake when the rest of the team goes down to the snow level.Since Yusuf is the dreamer of level 1, he has to stay in that level of the dream, hence why he has to drive the van.

Yusuf is drinking a lot of champagne in the "real world" on the plane, so when he goes to sleep he has to pee (hence the rainfall).
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Cobb (Leo DiCaprio) uses the same type of con man repertoire as George Clooney in Oceans 11 - only Cobb knows how to literally do his work on a subconscious level. At heart, an extractor is a classic con man - he creates a false set of circumstances that manipulate the mark into revealing his secrets.

The Extractor - The extractor is a master con man, a person who knows how to manipulate a dreaming mark into revealing their deepest mental secrets.

Once they remember that limbo is limbo, they are able to wake themselves up (likely with a gunshot to the head). Cobb and Saito are able to remember the meaningful conversations they had and that there is a reality they existed in before Limbo, where both of them had deep desires still waiting to be fulfilled (Cobb and his kids, Saito and his business).
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Through Saito's memory of Cobb's totem and some shared dialogue that included key trigger phrases - "Leap of faith," "Old man full of regret, waiting to die alone," etc. When Cobb has to "wake" again in Limbo, his mind is muddled just like old man Saito's brain. Mal's shadow stabs Cobb during the film's climax, which throws Cobb back out into Limbo and onto the shores of Saito's limbo house. By the time Cobb deals with expelling Mal's "shadow" from his subconscious, Saito has begun to perceive himself as an old man. When Saito "dies" from the gunshot wound he received on level 1 of the dream, his mind falls into Limbo, and Saito remains there for the minutes it takes Cobb and Ariadne (Ellen Page) to follow him into Limbo - those minutes in one dream state feel like decades to Saito in his Limbo state. In Limbo, the mind works so fast that actual minutes can be interpreted as years gone by.
