In the lines "The way you rock and roll" and "When you do the stroll," "roll" and "stroll" are both sung with melismas (I think they're E D C# and E C# A, respectively), musically giving a sense of movement.
In the line "Love me 'fore I grow too old," "old" is sung with a melisma (B A), giving a sense of degree (for "too"), and similarly, in the line "Ooh, girl, you look so fine," "fine" is sung with a melisma (E C# A, I think), giving a sense of degree (for "so").