A bottle of "Old Mice" is visible on Mickey's bathroom counter.
The opera singer is Clara Cluck, who was originally voiced by a real operatic soprano, Florence Gil. Incidentally, the song she's singing is from Rossini's 'Barber of Seville' but her costume is from Wagner.
Legendary Canadian broadcaster and former NHL coach of the year, Don Cherry, is the voice of the hockey play-by-play
Mickey thanks Goofy for lending him his ears, a likely reference to Shakespeare's 'Julius Caesar' and Mark Anthony's speech "Friends, Romans, countrymen, lend me your ears."