Jon: In just a moment, I'll ask you to select one of three envelopes. In each of these envelopes, you'll find three different sets of clues unique to each player
The players aren't shown picking up the envelopes; in one frame Jon says "Let's go!" and in the next frame you see the three walking off with their envelopes. Could producers have created nine different trips? Possibly, but I doubt it; I think each player's trip was the same, no matter which envelope was chosen. Then why not hand out tagged envelopes to each player? Beats me; appearance of randomness, maybe?