Thillu Mullu stands out as a classic Tamil comedy that balances humor with a well-structured screenplay. The story is engaging, with a clever premise that sustains interest through its twists and situational comedy. The screenplay is tight, particularly in the first half, which sets up the characters and conflict effectively, while the second half escalates the comedic situations, maintaining a brisk pace without dragging.

The songs composed by M. S. Viswanathan complement the narrative well, blending seamlessly into the film without disrupting the flow. The background score enhances the comedic timing and emotional beats, adding depth to the viewing experience. Cinematography by B. S. Lokanath captures the urban setting with clarity, supporting the film's light and lively mood.

Overall, the film's pacing is well-managed, with the humor and narrative progression balanced to keep the audience entertained throughout. The direction by K. Balachander ensures that the comedy remains situational rather than slapstick, which contributes to the film's enduring appeal.

Rajinikanth: Delivers a charismatic and nuanced comic performance, showcasing his versatility beyond action roles.

Madhavi: Provides a charming and supportive role, complementing Rajinikanth's character well.

Thengai Srinivasan: Excels in comic timing, adding significant humor to the narrative.