saw this on another site..not sure how accurate it is but sounds ok
Some dots are magnetic, he also conceals some under his hand and changes the positioning until the final reveal where he places them all on the one side of the card.
He has 2 x 3 of Spades. Aisha could pick any card. Instead of giving the Jack for Aisha to fold herself, he palms the Jack and folds the 3 of Spades and gives it her. Again, just palms the 3 of Spades and actually gives Travis the Jack. The whole time they had their partner's card
BB shows Lawson shaving his forearm. He writes the 4 of ____(red) card with soap so it can't be seen. When he tells Lisa to stop there's a brief moment when he closes the deck and inserts the 4. He then only needs to rub some form of chalk and it sticks to the soap creating the number