Similarties: Things that are smiliar in the play and the movie, is that Viola dressed as Sebastian to complete something, Duke Orsino fell in love with Olivia, Olivia fell in love with Sebastian who was Viola at the time, and Viola fell in love with Duke Orsino. Everything in the movie and in play were about the same, the same characters. In the play Duke Orsino says to Viola "And since you called me 'master' for so long, here is my hand. you shall from this time be, your master's mistress" (V.I. 312-314)
Differences: Things different from the movie and the play is that Malvolio was the spider and wasn't a man, Viola wanted to do soccer than work, Olivia had a boyfriend at the beginning of the movie, Duke Orsino was in soccer too, Sir Andrew and Sir Toby were friends with Duke Orsino and played soccer with him, Cesario's was the name of the restaurant instead of the character Viola said she was.