Visible crew/equipment: During the premiere of The Royal Rascal's when the bad guy goes over the edge of the banister, you can see a crewman's hands catching his legs. (00:11:30)
Visible crew/equipment: In the "Good Morning" dance sequence when the trio exit the kitchen and move into the living room, the plywood wall separating the two rooms is visible so it is clear that this was shot on a stage rather than in a house.
Visible crew/equipment: During the Broadway Melody, the shadow of the hanging boom mic becomes visible. This happens during the sequence filmed in the large sound stage. Kelly is dancing with a woman with a long fabric flowing behind her. The shadow is on the right side.
Suggested correction: I can see no shadow at any point in this scene. Could you provide a time stamp or screen capture? Besides, there is no spoken dialog or even any natural sound in the scene. Why would they be using a boom mike?
It's on the right, center side of the screen when the lady with the long flowing dress is further away and the shot cranes up. This is a musical number, Kelly is singing. They would still use a microphone.
Are you talking about the fantasy sequence between Kelley and Cyd Charisse? If you mean the faint shadow at 1:25:18, that is a shadow from the flowing cloth. And no, they would not be using a microphone. 1) There is no singing in that sequence. 2) In musicals at the time, all singing was pre-recorded and the actors lip-synced to a playback on stage.