In the beginning of the episode, Frasier is having great difficulty understanding the caller when she says the word "monsieur". However, various other episodes of the show portray Frasier as clearly fluent in French.
Towards the end of the episode, when Daphne is treating Martin she relates her family tradition of dock work, including her brother Billy's announcement that he "hated the smell of fish". Manchester is 40 miles from the sea, and although connected to it via a canal, it has no fishing port, only a general cargo terminal.