A jolly hour on the trolley?
I don't get the scene (although I LOVE the song).
Esther and her friends board the trolley on a lovely afternoon. Esther is visibly upset that John has apparently missed it; we see him running, trying to catch it. Esther turns away from watching him run to sing the song, which she does beautifully. Presumably she does not see him get aboard, not that it matters. John climbs up to sit next to her.
Esther freaks out. Why? She looks very surprised, almost disappointed, to see him. What possible direction could she have been given for that strange reaction? To me, the look on her face says "oh no -- now what do I do?" Wasn't she happy to see him?