Prue and Phoebe figure out they can just "call" Leo, so this is the 1st time.
This episode features the third and final appearance of Prue's boss Mr. Caldwell. Surprisingly, despite having had dialog in each of his appearances, the actor was never credited for his appearances.
This is the fifth time one of the sisters has been in the hospital and this is actually Piper's second time.
After appearing off and on, from this episode through most of the rest of the series Brian Krause as Leo is effectively a regular and is in every episode.
The exterior shots of the hospital is St. Vincent de Paul in Portland, OR.