With just under four minutes left in the first quarter, Wade drove into the middle of the key and threw the ball up after he was only a couple of feet into the lane. James was flying in from the left and caught the ball when it was more than five feet from the basket. The image below shows James just as he caught the ball from Wade (click on the image for a larger view).
James left the court at nearly 10 mph and took about half a second to leave the court, grab the ball, and slam it into to the basket. He threw the ball into the hole at a speed of about 36 mph. The ball was rotating at close to 145 rpm with respect to his right shoulder. That rotational speed is about one third of the rotational speed of helicopter blades.
Moving on to under three minutes left in the first half, James had a dunk that was even more impressive that the one I showed above. Wade drove down the right side of the key and after going about four feet passed the foul line, tossed the ball up with his right hand. James was driving into the lane, just slightly left of center. Wade's toss actually went off the backboard before James caught it, and then followed with a dunk that had his head under the basket as the ball went through the hoop. The image below shows James just as he is catching the ball from its flight off the backboard (click on the image for a larger view).
As with the first dunk I described, James left the court at nearly 10 mph and was airborne for about half a second before throwing the ball into the hoop. The ball was moving about 13 mph away from the hoop when he caught it at the instant shown above. James then reversed the ball's trajectory by accelerating it to about seven times the magnitude of the acceleration due to gravity, or, simply, 7 g's. He threw ball into the basket at a speed of nearly 23 mph.
Both dunks described here require an extraordinary amount of athleticism. There may only be a tiny number of people walking the planet who could do what James did. Those dunks were certainly Christmas treats for those of us watching!