…yeah-- that's the funniest part!… …I remember it (the 'other' version) as being in slow motion, and I think it's a dummy-- not actually Ollie… …he goes sailing across the room…Stan's sitting in an easy chair smoking a pipe, reading the paper, Ollie goes sailing by, slo-mo, while the chair jumps…

They probably did that bit more than once, I wouldn't be surprised.