"The Winged Wizard" is one of the few episodes besides most Johan & Peewit episodes where the Smurfs aren't the main focus.
"The Winged Wizard" is the first appearance of the Great Book of Spells.
The "pentagram" which Gargamel is told to draw on the ground for the activation of one of the spells is actually a pentagon, as a pentagram is usually depicted as a star within a circle.
Although seen early in the episode Sir Hefty (1981), this episode shows the origin of Handy's Fire Engine and the Smurf Fire Brigade. So it's probably considered the prequel of the Sir Hefty events.