The language barrier proved to be the biggest obstacle. Mie and Kei had to hold English conversations through an on-set translator. The writers struggled because once dialogue had been written for and learned by the ladies, it could not be changed. This was particularly problematic when a guest star would be booked at the last minute, such as Lorne Greene, who agreed to appear on the show only four hours before the episode was taped. Mie and Kei wanted to sing the songs that had made them famous in their native country, but NBC insisted they perform in English. This resulted in recording English songs phonetically and lip-syncing for the show's tapings. Lip-syncing was already a common practice on American variety shows, but it was especially noticeable since the ladies were performing in a language that was foreign to them. Additional problems were caused when the network insisted the writers develop separate identities for Mie and Kei. The established "Pink Lady" act was that they were so much in unison that they performed as one entity, so the two were not comfortable having separate stage personalities.