Martin claims that he still has the badge he wore while he was with the Seattle Police Department. US law enforcement agencies take back the badges of retired officers.
The caller says he's going to school at "U.W." Students typically refer to it as "U-Dub."
At the very end, Roz opens a large box shipped to her from her aunt. She opens the top and proceeds to pull out ceramic hippo after ceramic hippo, without any packing materials such as foam peanuts or bubble wrap or anything to separate and protect them from hitting each other and such during shipping. Miraculously, none of them are even so much as chipped. That would not happen in real life.
When Frasier (Kelsey Grammer), Niles (David Hyde Pierce) and Martin (John Mahoney) are rushing out to avoid Daphne's cooking, on the left top screen you can see a boom mic visible.
The French Maitre D's rolled a Spanish "R" when he said "tree" (for the word "three") instead of the guttural French R he managed for most of his other accented words. The actor playing the French Maitre D' is from Colombia, where Spanish---the European language from Spain---is the native tongue.
Just like in USA, French men never ever kiss other men they don't know on the cheeks upon greeting. This is true of casual settings between friends, and especially not in a professional, business meeting. The production (writers, no doubt) evidently confused the French with their effusive European neighbors, the Italians. A high level of professional and formal decorum is observed at all times when doing business in France.
In order to encourage Frasier, Niles and Martin to vacate the apartment, Daphne declares her intention to "have a go" at making haggis, having claimed to have spotted calves' stomach in the butchers. Haggis is made from sheep's pluck (offal), mixed with oatmeal, and encased in a sheep's stomach-not a calf stomach, and it's a Scottish delicacy, nothing to do with English cuisine, as is implied.