Factual error: When Monica rolls an 8 to buy everyone a steak dinner, the one die is positioned with a 5 and 4 facing the camera (the 5 on the left, and 4 on the right). With the die that way round a 1 is always on top. There is no other way to get the 5 and 4 combo. This means that Monica had a 7 on the other die, That is impossible. And so she did not roll an 8.
Continuity mistake: In the bar, Cathy is trying to set Chandler up with one of her friends. When the camera is facing Chandler, we see Cathy's hand rubbing Joey's back, but when it cuts to a front shot of Joey and Cathy, her arm is down in front of her. Then without having had enough time to move, her elbow is up on the table and she is holding hands with Joey.
Continuity mistake: At the beginning of the episode where they are watching Ross through the window, Phoebe is leaning forward and standing to the left of the pole next to Chandler. When the shot changes to Ross coming through the door, she is suddenly standing up straight and is now behind Joey and Chandler.