Unlike the cartoon series, where the main staple of the Smurfs' diet is Smurfberries, in the comics it is sarsaparilla (smilax regelii), a plant native to the Americas used as an ingredient for soft drinks like root beer. Peyo's partner Yvan Delporte introduced it to the comics because he found the name magical ("salsepareille" in French), and the word seemed so foreign to Peyo he originally believed Delporte made it up.
Gargamel's cat Azrael is named after the angel of death in Hebrew and Islamic traditions.
One of the very first cartoon projects to be dubbed into Icelandic. As a sign of how primitive that work was, the entire cast of characters was dubbed by just one man (Laddi).
When choked a Smurf turns yellow.
Contrary to popular belief, the phrase that is often described the height of most Smurfs ("three apples high," the direct translation of the French idiom "haut comme trois pommes") was never a precise scientific measurement. It means that something is really small, and an English equivalent would be "knee-high to a grasshopper."