In the beginning of the movie, the babe in the convertible gives Juan the soda can you can see the billboard in the background read. Juan go to 11300 vanit, but that was not to be seen until Juan gives the check back 30 days later.
Juan never officially deposited the 1 million dollar check but somehow he is able to buy things without money or a credit card by just showing the check around.
In spite of the fact that Mr. Ortiz is obviously grabbing for a can, instead of showing it, he shows a Lowriding magazine instead.