Continuity mistake: When Cosmo and Don are doing the violin routine, Cosmo's violin bow string comes loose in one shot and then all of a sudden is fixed in the next. (00:06:45)
Continuity mistake: In the scene where Don Lockwood is dueling in "The Royal Rascal" at the beginning of the movie, when Don opens the balcony door and the other dueller comes after him, Don flips him over the balcony and he splashes into a puddle. Meanwhile, two guys come out after Don. The next scene, one guy is lying on the balcony, Don jumps over the balcony landing on his back, and there is no puddle, no guy lying on the ground, but a bushy garden instead. (00:11:55)
Continuity mistake: When Gene Kelly and Donald O'Conner stop for car trouble, a trolley goes by. After Gene gets bombarded by fans and runs away, he runs after another trolley going by and jumps on. The same people are in the trolley each time. (00:14:50)
Continuity mistake: When Don jumps into Kathy's car, in the long shot, as he lands her hand is on her hat. Cut to the close up, and both her hands are on the wheel. (00:15:30)
Continuity mistake: As the girls are dancing at the after movie party, during one spot the streamers being thrown get tangled around their legs. Then in the next shot it's cleared itself up. (00:24:00)
Continuity mistake: During "Make 'em Laugh" Donald gets flipped off the board, and sings on the ground. There is a man sweeping next to him. You see the broom coming in and out of frame near his feet. When the shot goes long, the sweeper is behind Donald, and no one is next to him. (00:28:15)
Continuity mistake: During "Make 'em Laugh" the green couch moves to the right from the time he dances with the mummy to the end of the number. (00:29:10 - 00:30:30)
Continuity mistake: During "Make 'em Laugh" Donald is hopping on one foot and falls down. The couch is behind him and he falls at an angle. The camera changes, and he's suddenly perpendicular to the couch instead of at an angle. (00:29:10)
Continuity mistake: During "Make 'em Laugh" Donald is dancing on the green couch with the 'dummy'. When he spins around and jumps on the back of the couch, his hat changes from down low over his brow to higher on his forehead between long and close shots. (00:29:15)
Continuity mistake: After Kathy and Don find each other again, and he's trying to tell her how he feels for her, they are walking outside on a sunny day. He opens a door to go into a set, but when the camera angle changes, it appears as though they are walking from a dimly lit hallway. (00:41:30)
Continuity mistake: When the diction coach working with Gene Kelly is saying "sniffed his snifter" he has his hand in the air, and in the quick cut, it's suddenly on the book he's holding. (00:47:25)
Continuity mistake: When Gene Kelly and Donald O'Connor are with the diction coach, Donald O'Connor is making faces behind the coach's left shoulder when he gets caught. In the very next scene, he is caught again with the very same look on his face. (00:48:05)
Continuity mistake: When Don Lockwood is telling R.F. about the Broadway scene, when he says "It's called Broadway Melody," he has his hands right in front of him and he's looking at R.F. In the next shot he's looking down at his hands and then turns to R.F. again and puts his hands up in front of him. (01:15:20)
Continuity mistake: When Gene Kelly does his classic Singin' in the Rain dance scene, it's only raining in the front half of the shot. In long shots, you can see that the back part of the scene is enjoying clear weather. And, as he goes left, the rain slants right and vice versa.
Continuity mistake: When Don is caught by the cop while splashing around in the puddle during "Singin' in the Rain", Don's left hand jumps from his umbrella handle to down at his side between shots.
Continuity mistake: After singing "Good Morning" Don, Debbie and Cosmo are sitting on the couch laughing. Debbie leans her head on Cosmo's shoulder, then we cut to a closer shot and she's suddenly holding her head straight up.
Continuity mistake: There are two continuity mistakes when Don Lockwood makes his escape from his fans, and jumps onto the passing trolley. He climbs to the trolley roof and walks along the roof to the back of the trolley, when he jumps off to land in Kathy's car. However, in the next shot he's jumped off the front of the trolley, not the back. Also, in the distant shot, Kathy jumps as he lands in her car, but when the shot changes to a close-up, she's calm and then jumps a second later.
Answer: The line is "... no one would come and see me jump off the Woolworth Building into a damp rag."
Myridon