The extras at the airport with Rachel are different than the ones in the Season 1 finale.
When Paolo comes out of Rachel's bedroom, Phoebe gets up from her chair, but the next shot from behind the couch shows Phoebe still sitting in the chair and starting to get up.
The extra behind Rachel at the airport wears a white blouse and has a thinner braid. In the previous episode's cliff hanger, she's wearing a sweater and her braid is thicker and longer.
The blood stain on Rachel's forehead after the injury she sustained at the airport changes size numerous times between shots.
The lady with the braid standing near Rachel at the airport is a different person than in the previous episode.
When Ross and Julie are back at Monica and Rachel's apartment, Ross says that it is "6 o'clock tomorrow night our time." This is impossible because Beijing is 13 hours ahead of New York City. If it is 6pm in Beijing, it would be 5am in New York City on the same day.
When Paolo goes to greet Ross his voice cuts out while his mouth moves saying "Hey!", only to continue it later from a different shot saying "Hey, Ross!"
When Phoebe cuts Monica's hair too short (confusing Demi Moore and Dudley Moore), Monica clarifies who Demi Moore is by listing some of her movies including 'Ghost'. Demi Moore's hair in 'Ghost' was even shorter than the haircut Phoebe gives Monica.