When Moe goes to remove a spoon from the mouth of Curly, he tells him to open up. At that point Curly opens his mouth which negates the need for help.
It is evident that the full bottle of champagne Curly drinks just as the monkey enters the room started as empty, and merely serves as a vehicle for the sound effects.
The hotel room features a king size bed with a canopy over it. Moe remarks "A triple bed", but clearly there are only two levels.