Kids learn by frequent repetition, so it's no surprise that they want to hear again and again the same song, read the same book and watch the same movie. Thus, they extend their vocabulary and level of perception and memory.
After a while, they will enthusiastically "guess" the following line songs, fairy tales or movie. You can take advantage of such moments, and considering the interests of your child develop a conversation about his favorite characters, using new words and concepts. On the walk we can further extend the theme. Talk to your baby, bring him to life examples!