In "Azrael's Brain", Brainy was hiding between four cooking pans hung in Gargamel's hovel when one of them accidentally fell and hit Gargamel's head. In the next camera shot, Brainy was hiding between the same number of pans (four) instead of three.
In "Azrael's Brain", even though four Smurfs were caught by Azrael's trap, when Brainy frees them later on Snappy and Hefty are the only Smurfs in it.
In "Azrael's Brain", Azrael captured four Smurfs (including Papa Smurf) using the machine he invented before he returned to Gargamel's hovel. However, in the hovel, five Smurfs are shown kept in a locked glass container.