Kiss (aka A Prelude to a Kiss) - S1-E3
Visible crew/equipment: When Joey, Bessie, and Bodie are at the seaside restaurant talking about how large Bessie looks (during her pregnancy), you can see a boom microphone dipping in and out of the picture above Bessie's head. (00:07:40)
Answer: It's only explained once in the series. Jack says to Andie "I tried to start kindergarten without you", meaning Andie was smart enough to start school early.