Visible crew/equipment: As Dorothy is leaving Munchkinland the shadow of the camera on its dolly can be seen on the floor to the right of the screen as several Munchkins almost get run over. The shadow of the cameraman's head can be seen on the bottom right of the screen as they pass her house.
Visible crew/equipment: The four run away from the guards and leave the tower where the Wicked Witch is eventually melted. If you look closely in the two long shots from above them, the Tin Man reflects the bright stage light that is placed below them at the first bend of the walkway, on top of the Witch's castle.
Continuity mistake: When everyone is dancing because the witch is dead, joyous soldiers are marching in a straight line, just before the three dancers who represent the lullaby league sing. In one wide shot there are many Munchkins dancing over to form a crowd to the right of the soldiers, but in the next shot all the Munchkins are already standing in one big perfectly formed crowd.