Rule reminder

Common errors in Italian comparatives: (1) using 'più migliore' (double comparative); (2) 'più bene/più male' instead of meglio/peggio; (3) using 'di' instead of 'che' when comparing two adjectives on the same noun; (4) missing article in 'il doppio'; (5) wrong preposition with 'superiore/inferiore' (must use 'a', not 'di'); (6) 'di gran lunga' with wrong preposition.