When Jimmie is trying to explain to Daphne in the police station what's going on, she slaps him, then pins him against the wall with her right hand, with her left raised. In the next shot, her hands are switched.
As the bride mob is chasing Jimmie, the overwhelming majority of the brides are seen wearing white sneakers/tennis shoes. Either every bride anticipated running after Jimmie or the extras playing the brides were told to wear comfortable shoes fit for running.
The goof item below may give away important plot points.
At the very end of the movie, when Jimmie and Anne are on the fire escape, the bouquet she has in her hands keeps changing. One minute it has peach-colored roses and the next it is all yellow flowers. It switches back and forth at least three times.