For this production, as well as for the 1986 Glyndebourne stage production on which this is based, director Trevor Nunn
decided that it would be more effective to have Porgy walking with the aid of a crutch rather than riding around on a soapbox fitted out with wheels and pulled by a goat, as in all previous productions of the opera. He felt (rightly or wrongly) that this would make Porgy more sexually attractive to Bess. See more
[singing to Bess
Picnics is all right for these small town suckers, but we is used to the high life, you know. You an' me, we understands each other. I can't see for the life of me what you is hangin' round this place for. Why, with your looks Bess, and your way with the boys, there's big money for you and me in New York.
I can't remember meetin' nuttin' that I likes less than I does you!