"Dekh Hame Awaaz Na Dena" (Rafi - Asha) from Amar Deep and Shanker Jaikishan's "Yeh Mera Deewanapan Hai" (Mukesh) from Yahudi were two different interpretations of the same basic source
Only film in which 3 dancers & actresses Vyjayanthimala, Padmini, Ragini were present, but they had no scene together. Padmini & Ragini has shared screen space here, but Vyjayanthimala has only one scene with Padmini & no scene with Ragini. Only in the song "Is Jahan Ka Pyar Jhutha", 3 actresses are shown together. In that scene, Dev Anand, Johnny Walker (lover of Ragini here), Pran are also present. So, it's the only scene in the film, where entire main cast were there.
Actresses Vyjayanthimala & Padmini were cast together in Gemini Film's Raj Tilak, which also came in the same year (1958). In Raj Tilak, Padmini was as heroine & Vyjayanthimala was as vamp, but in Amar Deep, both were as long lost sisters. In both films, both were in love triangle with the lead heroes, but at the end of the film, Vyjayanthimala was dying in Raj Tilak, where as Padmini was dying in Amar Deep. Both films have Pran as villain & C. Ramchandra as music director.
Only film of Dev Anand & Padmini. First film of Dev Anand & Vyjayanthimala pair, they worked later in Jewel Thief (1967) & Duniya (1968). Ragini had no scene with Dev Anand here, but she worked with Dev Anand in Sarhad (1960), where she had a number of scenes (including songs) together, despite being a vamp.