[AaronBrown]

I assume this was online, but if it was bricks and mortar, you should pay attention to the suits of the King. On the first hand, your two Kings were together when the cards were gathered in, and the two Kings on the board were also near each other. On the second hand, the two Kings on the board ended up near each other. If they were the two Kings from your hand, or the two from the board last time, it's likely that the shuffle is imperfect, which is something you can exploit.

Only one time in 133 will both cards from a pocket holding show up on the next board with a perfect shuffle, and only 1 time in 16 will two cards from the previous board be on the next board. If you notice it happening significantly more often than that (and it will with many dealers) you'd better pay attention because other players are.