In the opening crane-down shot at the open air party (about half way through the movie) you can see a tiny "hair in the gate" at the bottom-center of the screen. It is still there in the subsequent shot, but has obviously been removed in time for the next one.
When the group is leaving the first party, Eleanor Johnson talks to Sophie Maes before getting into the car. The shot then turns back to Sophie with her saying "Yea" when clearly her lips were not even moving.
At the stately home, the band resumes playing after Sidney Young falls off the top of the stage's wooden frame. In a following shot facing the band, the keyboardist removes his right playing hand from the keyboard placing it in his lap with his left hand prior to the last keyboard chord being played.
At the party, Sophie Maes (Megan Fox) gathers her hair in her right hand, holds it above her shoulders and lowers herself into the pool. She walks across the pool in water that is just deep enough to wet her bust and as she climbs out of the pool we can see a distinct "tide mark" on her halter-necked dress, above which her shoulders and neck are dry. In the next scene, Sophie emerges from a lift/elevator with wet shoulders and neck.
At the stately home, when Sydney says, "Do you want another drink?" and she says, "Yeah, I'll have a half of lager.", he gets up and touches her on the shoulder, with his fingers pointing down the front of her dress. In the next shot, with his hand still on her shoulder, his fingers are now pointing down her back.
When we first meet Sophie Maes (Megan Fox), she says she is a vegetarian and would never wear fur, yet we see her at the party towards the end of the movie wearing what looks like a real fur shawl. However, this is most likely a testament to how movie stars sell out their beliefs when they become famous.