Looking up bio info on Jack Coogan, I am shocked he was only in his early thirties here. Jack Coogan is the father of Jackie Coogan, the child actor who would a few years later star with Charlie Chaplin in THE KID and much later on, play Uncle Fester in The ADDAM'S FAMILY. Yes, you read that right, Uncle Fester's Dad is in this. One thing about Arbuckle, he's not afraid to defer laughs to Coogan or Keaton.
I think Paul mostly covered it in his review, though I'll give a higher rating. The stair gag is wonderful and is the type of trick camera angle gag Keaton would do so well in his own films. The movable star over the door also feels very Keatonesque and yes, the house falling over Arbuckle with Arbuckle standing where the window is foreshadows STEAMBOAT BILL, JR. However, being a mere stage prop versus an actual house, the danger of getting it wrong here is much less.
I too like the skit/stage feel of this one, harkening to an era where people went out for simple routine shows like this. They had no Youtube back then. No cats on ceiling fans for these folks. Another good example of a comedy like this is Charlie Chaplin's A NIGHT IN THE SHOW.
Paul hit the nail on the head concerning the ending few minutes after Molly Malone gets shot. Nothing more to add, though I do watch other Arbuckle films.