Once, Zhuang Zhou dreamed he was a butterfly, a butterfly flitting and fluttering about, happy with himself and doing as he pleased. He didn't know that he was Zhuang Zhou. Suddenly he woke up and there he was, solid and unmistakable Zhuang Zhou. But he didn't know if he was Zhuang Zhou who had dreamt he was a butterfly, or a butterfly dreaming that he was Zhuang Zhou. Between Zhuang Zhou and the butterfly there must be some distinction! This is called the Transformation of Things.
The image of Zhuang Zhou wondering if he was a man who dreamed of being a butterfly or a butterfly dreaming of being a man became so well known that whole dramas have been written on its theme. In the passage, Zhuang Zhou "[plays] with the theme of transformation", illustrating that "the distinction between waking and dreaming is another false dichotomy. If [one] distinguishes them, how can [one] tell if [one] is now dreaming or awake?"
From what I’ve read, it’s because of the ending: “The film ends with Amit (Amitabh) and Shobha (Jaya) living happily in their marriage.” It’s the kind of public narrative Jaya likely wanted, one where she “wins” her husband in the end.
Rekha even referred to herself as “the other woman” in a 1978 Stardust interview: “People say the wife is always one-up because she has the man. I say the ‘other woman’ is ten-up because the man wants her in spite of having a wife.”
She also claimed she was deeply hurt by Amitabh’s decision not to work with her anymore, though much of her frustration seemed directed at Jaya instead. In the same interview, she said: “I looked at you, you turned your face away. Why? You feel you are badly off, but can’t you see my position is worse?… There is deep hurt in your gaze, but can’t you see that the wounds in my heart are deeper than your look?”
I bet the atmosphere on set was incredibly tense…