Color adds to the comedy in many ways. Subtly, the light of the candle drew my attention to it, showing the wax dripping off at a slant which is a funny bit. In n the end Lucy falling into the mud is made funnier by contrasting her pink pajamas with the brown of the mud.
The film is shot cinematically, which contrasts with TV. We start with a shot of Lucy, which pulls back, and moves to frame on a two shot. Though subtle, it is a more complex shot than one would see in early TV. We also have reverse angle cutting common to film, whereas TV at the time was shot more frontally, without the back and forth over-the-shoulders. I Love Lucy was shot with three cameras for a live audience. In the film, the reverse shot's foreground is a bit out of focus (side view of Lucy, and back of Ricky) whereas in TV both would be in focus because it was shot differently. The cinematography is also much better than in TV. We have a night scene, with candle light, and it looks beautiful. We see the cuts between outside (the Jack) and inside (the bedroom). TV sitcoms stayed within the room or set.
Also, the settings of film comedy were larger than you would find in a sitcom. 98% of a sitcom takes place on their set - usually a set of a few rooms - whereas a film can be on the road, going from one location to another.
Lucy contributed a great deal to comedy, and especially slapstick comedy. Who can ever forget the candy factory scene, which is now iconic. Minelly could use her physicality in the clip, trying to stay upright in a slanted cabin, falling out of the bed, and eventually falling backward into a pool of mud.