When Phoebe sits down in Central Perk with Monica and Rachel, she drops her bag on the floor. In the net shot it's right next to her on the armchair.
Argentines don't say "olé", only Spaniards says that.
At the beginning of the episode, Monica tells the gang that her restaurant is booked out months in advance. Later, when Phoebe is busking outside the restaurant, there's a line of people waiting to get in. If it were fully booked, there would be no point waiting in a queue.
When polling the patrons, Monica says "pretension" when she meant "pretense."