Continuity mistake: When Sean shows up to meet with Mary Kate and her brother he is carrying pink roses. The entire time he is in the house the roses are now red.
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: As Lana Turner and Kirk Douglas are toasting with champagne, the cigarette she is holding disappears.
Continuity mistake: In the scene where Bing Crosby is talking to Ethel Barrymore at a picnic day for the girls of he very snobbish school, he makes a big deal out of taking out a cigarette and lighting it, but in the next shot - no cigarette.
Continuity mistake: When Bob Hope is tied to the raised barber chair you can tell it is his stunt double in the far away shots because of the way his hair changes.