 As in _Putty Tat Trouble (1951)_ (qv), we can see a sign on the  building directly adjacent to Tweetys that says, Drink Friz! 6  Delicious Flavours. It is a reference to Friz Freleng (qv), but  slightly altered. In _Putty Tat Trouble (1951)_ (qv), it was  referenced as a gelatin dessert. Now its a drink.