R D Burman was an accomplished mouth organ player. He played mouth organ in the song "Hai Apna Dil To Aawara.." for the film Solva Saal, and, for the song "Rahi Manwa Dukh Ki Chinta..' for the film Dosti.
Pancham composed the songs "Aye Meri Topi Palat Ke Aa" and "Sir Jo Tera Chakraye.." at the age of 9, which were later used in the films Funtoosh and Pyaasa respectively, by his father.
R D Burman acted in the films Bhoot Bangla and Pyar Ka Mausam. Mahmood wanted him to act in his film Padosan, but, Pancham refused and the role was offered to Kishore Kumar.
R D Burman was the first to introduce double track recording for the film Baharon Ke Sapne, way back in 1968!
R D Burman was the first to introduce the Brazilian bossa nova rhythm in Hindi film music for the song "Maar Daalega Dard-e-Jigar.." (Pati Patni).
Before starting his career as a playback singer cum actor, Kishore Kumar, sang a song for Saraswati Devi, in chorus for the film Bandhan. The song was "Chal Chal Re Naujawn.."
Though he was particular about his payments/money for work. There were few friends for whom he would sing for free. Rajesh Khanna & Danny Denzongpa were among those lucky people.
During emergency 1975-77 his songs were banned to go on air. Reason: He denied to sing for Indian National Congress.
Kishore Kumar sang in both male and female voices for a duet song ‘Aake Seedhi Lagi Dil Pe‘. This song was featured in the movie Half Ticket.
There was always a signboard that read ‘Beware of Kishore’ at the gate of his apartment at Warden Road in South Mumbai.