Sellers often caused interruptions by leaving the set for days at a time. The rift between Orson Welles and Peter Sellers was partly caused by the arrival on set of Princess Margaret, sister of the Queen. Sellers knew her of old and greeted her in an ostentatious manner to ensure all cast and crew noticed. However, the Princess walked straight past him and made a big fuss over Welles. Nonplussed, Sellers stormed off the set and refused to film with Welles again. An enormous Taj Mahal-type ...