Lisa Kudrow received a degree in Biology from Vassar College, and Mira Sorvino a degree in Asian Studies from Harvard University, so during production of Romy and Michele, they nicknamed each other "Smart" and "Smarter".
In one scene, Christy played a trick on Michelle by putting magnets on her back brace. The actress who played Christy, Julia Campbell, wore a back brace in real life when she developed scoliosis at age 11. At 15, she had to have corrective surgery when her spine started cutting into her right lung. She has since recovered but cannot partake in any physical activities that puts pressure on her spine.
In the dream reunion scene, when Romy and Michelle are on stage to receive their award, you can see just above the stage in the lights that are strung what looks like a banana on one side, and a carrot on the other just like the magnets that Christie put on Michelle's back brace in high school.
The trailer has a small bit of dialog edited out of the movie: In a scene from the film used in the trailer, Michele tells the A-list girls "We're not the ones who got fat," to which Christine replies "We're pregnant." In the trailer Michele then retorts "Okay, we're not the ones who got pregnant," but this line does not appear in the movie.