 When Billy Wilder (qv) and Charles Brackett (qv) turned in their  script, the studio liked it, but felt it needed some work. The  writers they hired to rewrite the script were: Billy Wilder and  Charles Brackett. The studio sent them their own script to rewrite  without knowing it. Wilder and Brackett simply retyped their  original script and the studio loved the "rewrites" so much, they  produced it with no further "changes".