Revealing mistake: When Janey falls through the stairs you can tell that it is a stunt double because she's really buff, unlike Chyler Leigh. (00:37:35)
Revealing mistake: In the scene when Janey falls through the steps, you can see that the double pulls herself into a small room at the bottom of the hole to keep her from getting hit by the falling items which are the second part of the falling joke. (00:41:00)
Revealing mistake: In the end at the airport, when Ricky walks up to the line to give his part of the story, you can clearly see a light reflecting off the black cap on Ricky's tooth, to make it look like he has lost one. (01:14:40)
Answer: I dont think there was, it was just another guest star appearance.
-Gyro-