The caller with the boring voice is Henry Mancini, whose "Moon River" is played just after he calls.
Fraiser's (Kelsey Grammer) first caller, the 13 year old who has trouble at school and belittles his advice, is Elijah Wood
In this episode Roz (Peri Gilpin) agreed to go out on a date with Noel 'the mole'. This was the beginning of Noel's years of infatuation with her.