When Esther Williams is hoisted into the air by helicopter, she sheds her water skis in order to safely make the high dive. After the dive when she grabs the towbar from the boat, her skis have somehow re-attached to her feet.
At the very end of Esther Williams's water-skiing extravaganza, the camera shoots a long pullback shot of her on a platform with flags hoisting into view on either side; the shot then makes a stationary jump (albeit on cue with the music) to the same shot with jet fountains coming in from both sides like a curtain closing. You can see it's two different shots because Williams's right hand is up in the first one, then suddenly down in the second.
while posing for photos with guests at the Cypress Gardens, Ester says clearly she will not possibly work that night...but she very obviously does not move her lips whatsoever during the very well enunciated line.