They're on the Blu-ray. Hard to miss them. Do you have the Blu-ray? There are many home video releases that feature tests and stuff with people who didn't get the part.
It's a fantastic transfer with stunning color. I really like Betty Hutton and think she was ideal for it. I watched the Garland stuff again and sorry Garland fans, she is just so out of it in those clips - no energy, lifeless, not funny - she sounds good, of course, because that stuff was...