Other mistake: When Lewis looks at the cup that he got from the coffee machine, the cup has two Jacks and two Aces. When he looks at the bottom of the cup, it has a Queen underneath giving him two pairs, but he tells Gwen the receptionist that he got a full house.
Suggested correction: There are more cards displayed on the right side of the 2 aces, we can't see them. There are probably 2 queens there.
No there aren't. There's only 4 cards on the side of the cup. That's the whole point of Wildcard Poker cups, 4 cards with one on the bottom.
Well actually there are 5 on the side of the cup, but indeed that still wouldn't be enough to get a full house with a queen. But still, he is allowed to be wrong.
There's only 4 cards on the side of the cup and the card at the bottom. Https://www.youtube.com/watch?v=ovq9xOQNamk and go to the 00:36 mark.
It's possibly because multiple takes were made of this scene and different cups were used. This can be evidenced by the cup that falls to the floor being different to the one seen in his hand. Presumably, in one take he did have a full house, but they forgot to use the correct cup in the shot that was used.