When Doris falls after being hit by the post, she lands with her both of her hands above her head. When Stephen comes in to save her, both of her hands are down by her sides.
Right before the "Once in a Blue Moon" number, there is a long shot of Stephen holding Doris under the moon. His lips are moving in this brief shot as if he's singing to her, but there is no vocal on the soundtrack.
Several times, when "Droopy" growls, her lips don't move.