Continuity: In series 4 ("The One With Joey's New Girlfriend") Gunther is pretending to collect birthdays, and Ross starts saying "mine's December the..." before being cut off. However, in this episode Ross says his is on October 18th.

Continuity: In the coffee house, when Ross and Joey are having a fight about Joey's proposal to Rachel, Ross does the "quote gesture" with his hands and Joey says he doesn't know what this means. In TOW the Secret Closet, Joey used it himself when talking to Chandler, in the scene where he asks him to bring a bobby pin to pick the closet's lock.

Continuity: When Rachel wakes up Emma during a nap, against Phoebe's advice, there is a shot of Emma in the cot. She is wearing a plain pink hat, but in the next shot, when Rachel lifts her out of the cot, she is wearing a white hat with what looks like little flowers on it.

Continuity: When Ross and Rachel are talking about which muffin she wants, her sleeves move up and down her arms with the different shots.

Revealing: When Emma starts crying and Rachel picks her up, look at how much the baby is moving when she takes it out of the cot. In the next shot it's suddenly only moving it's head, and very slowly at that. This is because it's a robot - and it's very obvious.

Other: In this episode when Joey and Ross are filling out the form for Ross's hand in the ER, Ross states that his birthday is October 18th. However in Season 1 - The One With George Stephanopoulos, when Joey and Chandler are pretending to take Ross to the hockey game for his birthday he says that his birthday was 7 months ago. He then asks if today is October 20th.