The human deck trick - note how the 3 of spades guy seemed to know that he was the 3 of spades. And although he told the back row on the right to raise their cards, he didn't similarly instruct the back row on the left yet they all raised their cards. Also, Mel B had never told people to go into rows of two they just happened to stand that way.
Seems pretty obvious that it wasn't 'random' audience members rather prepicked people. Wouldn't take much to have a black side and red side to each card and they revealed card colors based on where they ended up....
For any other tricks where he forced a card, while I don't know how he got it into the box, the whole rest of the trick is really basic! Obviously the picture of Howie was preprinted (since magic isn't real right?) and he forced a card. So all that is the most basic trick in the world....and the judges react shocked (like how in the world did he know which card I would pick, or since he 'couldn't have known', how did he instantly print a pic of Howie!)