No. Not everything is a literal stage direction.
The "note" in the front of the libretto says it all---
"The set contains only what is necessary to suggest the places and the events of the story. Even the bridges themselves may be represented in images alone. Costumes will reveal the time and place. Projections may be used to give us a sense of Robert’s photographic style and skill. The piece may feel at times like a memory or a lucid dream, in that people can appear whenever anyone onstage thinks of them. The center of the world is Francesca herself, everything circles around her, though she is not really aware of this. If you asked her who the main character was, she would say it was Bud or the kids. But it isn’t. It is her story. "