Lucille Ball had a stunt double for her, in the skiing scene with Fernando Lamas that allegedly broke her leg during the stunt.
Hazel Pierce, the woman who plays the waitress serving Fernando Lamas, appeared in many I Love Lucy episodes. If you watch carefully, she can be easily spotted in many of them. In addition, she was Lucille Ball's stand in.
Like Hazel Pierce, Louis Nicoletti was another actor who appeared over and over in I Love Lucy episodes. In this episode, he plays the hotel clerk on duty behind the desk. After watching many an episode of the series, it is fun to spot these two in other episodes.