Ross confesses to Monica that he cut the legs off her Ken doll when they were children. Monica says "That was you?" Monica and Ross were the only children - there was nobody else it could have been. Response: It could have been a visitor to the house, such as a friend or neighbor child or cousin.
When Rachel brings out the coffee to Phoebe outside, an applause clip is played because Stephanie's song has ended. However, looking through the window, it can be seen that no one in the coffeehouse is clapping.
When Joey and Chandler ask the girl if she wants to smell the baby, she says "I assume we are talking about the baby now?" In the next take, it is visible she is repeating the same thing with no voice.
Shadows of the crew and camera are visible on Joey and Chandler as they attempt to talk to the girls on the bus, when it comes to a stop.