Continuity mistake: When the Grand Duke arrives at the inn, his sword keeps disappearing and re-appearing between shots.
Continuity mistake: When the Scarlet Pumpernickel is kissing Melissa Duck's hand at the inn, he is wearing his hat on his head but in the next shot he is holding the hat in his left hand. The wig stand on the table also has nothing on it, but in the next shot a wig suddenly appears.
Revealing mistake: When Melissa Duck runs down the aisle with the Scarlet Pumpernickel at the church, you can see that the other wedding guests in the background have no faces on them.
Continuity mistake: When the Scarlet Pumpernickel (Daffy) takes a box outside his pocket when he arrives at the church, you can see that there is nothing on the box and he puts his hand on the box to open it. But when we see the box in the next shot, it now has "Ye Olde Olympic High Jumper" on it and the Scarlet Pumpernickel's hand is no longer on the box.
Continuity mistake: When Daffy begins reading "The Scarlet Pumpernickel" at the start of the cartoon, you can see that the script is by the wall. Later on, both Daffy and the script are in front of J.L.'s desk, and a few shots later they are near the wall again.