In "The Magnifying Mixture," when Papa Smurf used the magic mixture to enlarge Azrael, Azrael's eyes changed from yellow to white when he became gigantic.
In "The Magnifying Mixture" during its original Saturday morning cartoon run, as Hefty drags the sack containing Gargamel and Azrael into the village and the other Smurfs gasp, "Gargamel! Azrael!", Hefty says, "There's nothing to fear; I've singlehandedly captured them once and for all!" to which Gargamel replies, "That's what you think!" But after Hefty says his lines, his mouth still moves when we hear Gargamel's line being said. This problem was fixed in the syndicated version's run by having some scenes repeated as Gargamel says his line.