Near the end of the final episode of the second series, as Ally gets off Bobby's boat, the rose attached to his jacket falls off. When he gets on Kenny's yacht, the rose has "re-attached" itself to Ally's jacket.
When Oz bangs onto the table in the Villa, he knocks over Dennis cup of coffee, it clearly leaves a brown stain on some paper work, when Dennis, Nev & Oz return to the table, the coffee stain has disappeared.