Corrected entry: In the one where Joey and Chandler buy a foosball table, Monica and Ross come over to play. The score as the blue team and are on the right hand side of the table. When the credits are rolling, Monica is playing against Joey and Chandler again. She is on the left hand side of the table but scores as the blue team again.
Corrected entry: In the scene where Joey is using his fingers to "talk to Ross as his future baby might", the camera switches between Ross and Joey many times. Just before Joey says "What is a lesbian?", you can see that Joey was laughing, but finally covered it up before delivering his line.