 According to Frank Sinatra Jr. on the DVD Commentary, Sammy Davis  Jr. was forced to stay at a "colors only" hotel during the filming  because Las Vega would not allow blacks to stay at the major hotels  despite his appearing with Sinatra, Martin, and the others at the  Sands Hotel. He was only allowed to stay at the major hotels,  therefore breaking Vegas unofficial color barrier after Frank  Sinatra confronted the casino owners on his behalf.