Continuity mistake: When we first see the 3 sailors walking down the NYC street, they are in a close-up shot that cuts off about where their knees would be. But the next shot of them as Miranda turns around; the sailors are much further away, showing all of them. Then for the final shot; the sailors are closer as they would be normally, but still not as close as the first shot. Their feet are still not showing.
Revealing mistake: During the scene when the girls are walking down the street, 'strutting' fully dressed up on their way to the Navy party, look behind them in the distance. There appears to be a great crowd of people gathered behind what might be a barrier. These look like people just watching the filming. This is more clear at the very beginning of the scene, when the girls first begin walking down the street. Also, in the TBS web site in the episode guide, there is a photo of this very same scene shot from a different side angle. You can see a definite barrier on the sidewalk to the left, filled with onlookers who are watching the filming. Thus, it's possible that the people in the rear visible in the show, are the same.