In "Hearts 'N 'Smurfs," Hun's (Van Garg's cat that looks like Azrael) nose appears white instead of black after Van Garg stumps the flower from a tulip bulb.
In "Hearts 'N 'Smurfs," Smurfette appeared briefly where she and the other Smurfs entered the Netherlands but was nowhere to be seen until the end when she and the other Smurfs were leaving. Also, prominent Smurfs like Grandpa are mysteriously absent in this episode without any explanation.