In one scene luke puts his hand next to his eye but in the next scene it is now by his waist.
Jessie puts her hand in her hair but in the next scene she has it away from her face.
Before jessie hits the green slab you can clearly see where it is cracked to break and it is clearly a different color.
Marco, the Director of Tourism, mispronounced "la Festa del Fuoco" as "la Festa del {fookoh}" which no native speaker of Italian would get wrong.
It's never explained how Bertram was able to get over to the Yacht to join Jessie and the Ross Kids on their vacation.