When the fake Monica meets the real Monica in the tap dance class, Monica says she is Dutch. The fake Monica says: "Mag ik deze dans van jou?", which is Dutch for "May I have this dance?". See more...
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Visible crew/equipment: When Ross is on the balcony trying to comfort Rachel after she has split up with Paolo, we see a couple of shots from the balcony looking into Monica's apartment. If you look at the top of the screen you can see where the walls of the set end, and all the stage lights hanging from the ceiling of the studio.