Hanks didn't want Uma Thurman because he felt she was "Too New"???
Apparently Uma Thurman was supposed to get Melanie Griffith's role (even the director loved her), but Hanks told him not to cast her because she was too inexperienced. What a jerk- Thurman is miles better than Griffith as a performer, and had already been in high profile films like Dangerous Liaisons (1988.
Plus this film tanked majorly- something IMDB's trivia section oddly fails to mention. It is still known as one of the most notorious flops that came out of Hollywood.