When the friends put down their keys, the keys' positions change when the camera pans the apartment. See more...
In the scene where Ross has just explained to Joey & Chandler that he has to give up Marcel, there is an advert break. Immediately after the break, the shot shows the three guys sitting on the sofa in the coffee house. If you look at the positions that their hands are in, they are mimicking either "See no evil", "Hear no evil" or "Speak no evil". I think this was done deliberately but since there isn't much laughter, I don't think the studio audience spotted it. See more...
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The entry you are correcting is:
|Original entry||All the friends have a lot of expensive things in their apartments, but you have only seen them lock their doors twice.|