During the Jingle Bell Rock performance, Regina's mother gets out the video camera...and gets up out of her seat to dance along in the aisle. And nobody pays attention to her. She even takes a little bow at the end!
The original version of the scene where Cady takes flowers to Regina. In front of the congregation, Regina's mother says she has lost so much weight since the injury the doctor has recommended - you guess it - Kalteen Bars. Regina screams an unearthly Big NO. The congregation flee at the sound of the noise. Cady is met by a stampede of people at the front door and, unable to get inside, throws the bouquet of flowers in the door as she gets swept away by the crowd.
This bit, when Regina is "crying" over how mean the Burn Book is.
Duval: Good Lord... What's that say? "Caitlyn Carson is a...?"
"Aw, hell no, I did not leave the south side for this!"
Karen's portion of the montage where the girls prepare for Spring Fling: She's seen putting stick-on rhinestones on her chest in the shape of a K, apparently the final step in her getting ready. Then the camera pans out to reveal that we've been seeing her in the mirror, and thus she had actually just put the K on backwards.
The scene where Janis yells at Cady is mostly depressing, but Damien yelling, "And I want my pink shirt back!" as they drive off is worth a chuckle.