I don't recall seeing any on-line chatter about Ernest's fall from the rooftop each night. It's one of those very well choreographed moments that shocks a few balcony guests. Every show, I see theatregoers perk up and rise out of their seats to see how and where he fell.
Sieber signals to the production that he is ready for the fall by extending his left arm - the potion held in his left hand.
Viola takes the potion from Ernest, asks him to say hello to Shakespeare, then Ernest falls into the orchestra pit.