Continuity mistake: In court, the camera shows Susan to judge her reaction to the lawyer talking, and she is sitting upright in her seat. It then changes to Dori, who is sitting right next to Susan. If you look in the bottom left hand corner however, you'll see that Susan is no longer sitting upright, and is instead leaning on Dori. There would be no time however for Susan to lean on her mother in the time the camera takes to move to another shot.
Continuity mistake: When drunk Santa knocks the sleigh off the float, you see the band members scatter. When the sleigh falls to the ground, there is nothing near it. In the next shot, the cymbal that clatters to the ground is right next to the sleigh, when it wasn't in the previous shot.