Movies have long been used for teaching in undergraduate science courses. However, embedding movie references (EMR) in science videos is a new trend. This study explored how EMR in YouTube science videos might affect the nature of comments and the process of learning science. Using constructivist grounded theory, we compared comments on two videos. "Up and Atom's" (UA) video presented quantum tunneling conventionally, while "Because Science"'s (BS) video used "Harry Potter" to illustrate the same concept. Content analysis revealed that comments on UA's video are more formal and focused on specific scientific concepts, while comments on BS's video are more casual and diverse, engaging more broadly with the science and video topic. Although conventional science videos may facilitate knowledge exchange and collaborative learning in the comments, these comments may spread misinformation when they lack context, authority, and expertise. Yet, science videos EMR connect scientific concepts with popular culture, and offer unique learning opportunities, including critique, creative thinking, and self-reflection. We argue, however, that EMR in science videos risks diverting attention away from the science content.