Continuity mistake: When Cornelius meets the girl in the red dress and they dance and sing outdoors on the street, her dress is dragging on the pavement and the hem is clearly filthy. The next scene they arrive at the restaurant and her dress is clean and pressed.
Continuity mistake: At the end of the town collapse, a sincerely drunk Ben dives head-on into a tub where a lady (in her underclothes?) is just enjoying a bath. Propelled by Ben's momentum the tub with both passengers slides down the slippery planks and splashes into the river, while Ben rearranges himself into a comfortable sitting position between shots. If I wasn't completely mistaken also the lady changes her outfit, since the embroidery is missing when they float along. (02:23:35)