Revealing mistake: When we see the duckling growing up to being Daffy Duck, the calendar behind him keeps changing months but the position of the days are exactly the same.
Nasty Quacks (1945)
1 revealing mistake - chronological order
Continuity mistake: When Daffy Duck is eating his breakfast at the table, the cup next to him has nothing in it but in the next shot a piece of buttered toast suddenly appears.