This study uses morphological analysis and quantitative methods to examine how racial slurs and expressions related to friendship evolve over time in the protagonist’s dialogue from the film Green Book. The dialogue was divided into six chronological and six word-count segments, and frequencies were measured for 11 racial slurs (e.g., “colored,” “Negro”) and five friendship terms (e.g., “brother,” “friend”). Morphological analysis classified lexical units, and co-occurrence networks visualized word relationships. The results showed that racial slurs were concentrated in the early segments across all divisions, while friendship terms increased in the later segments. Finer segmentation (three or more divisions) captured vocabulary shifts corresponding to narrative turning points. These results demonstrate that quantitative methods, such as morphological analysis, can reveal detailed linguistic patterns tied to character development.