Corrected entry: In the one with Monica's boots, Joey finds out that his younger sister Deena is pregnant. Joey then storms off to find her boyfriend Bobby and manages to find him. How would he be able to, though? It is made clear that Joey has never met Bobby before, therefore he would not know what he looks like or where to find him. Even if he did some how manage to find him how did he manage to do it so quickly?
Corrected entry: In the one with Sting's son Phoebe is reading an article in a magazine saying that Sting's son is in the same class at school as Ben and reads that he is seven years old, hence Ben is too. Later on when Ross tells Phoebe that Ben is seven Phoebe is shocked that is that old, as if she didn't already know.