Frasier (Kelsey Grammer) suggests the drinking song, Libiamo Brindisi from La Traviata. Niles (David Hyde Pierce) disagrees, saying that it is from Rigoletto. Frasier was correct.
When Niles shows up to Fraiser's apartment in a head to toe fisherman's get-up, he says "Call me Ishmael." This is the first line in "Moby Dick", the classic novel about fishermen and whale hunters.
All the while Frasier is in the fishing hut he is wearing the scarf knitted for him by his so called stalker Kari. (S2/Ep19)
The fishing cabin is presumed to be for the masculine man, yet on wall is a picture of a topless man with his jeans unbuttoned and you can see his shaved pubic area. So unless its a gay fishing cabin it seems out of context.
The remark Niles makes about how a person in Oshkosh, WI spent twenty years staring into an ice hole before he caught his first fish could be true, but refers to an entirely different type of fishing. Oshkosh is on the shores of Lake Winnebago, home to large lake sturgeon, which are taken in the wintertime by spearing them through large holes in the ice rather by hook and line. Since a fisherman is allowed only one sturgeon and that fish must be at least thirty-six inches in length, it is indeed possible someone could have spent that many years before being able to successfully spear a fish that was legally allowable.