I think the Jets showed their lack of experience. Early in the game they seemed nervous, missing a lot of passes, fumbling the puck and generally out of sorts. Later in the game they got better, but didn't really seem to know how to solve the Preds' defensive strategy. Myers' complete fail when he ponderously carried the puck up ice and then turned it over at the Preds' blueline was a perfect example of what was wrong with the Jets, and how badly Myers has played in this series.
Still, in the end this game was lost largely on the PP, which was completely ineffective. That's the Jets' best players, and they didn't get it done. They got killed on face-offs on their PP, which meant that they had to regroup constantly, and they had no answer for the Preds' defense of the zone entry.
I've had it with Myers on the PP, by the way. His play this series has been awful enough - to have him fumble around on the PP is just too much. I can't for the life of me understand why they don't have Morrissey on the 2nd PP, and turn it into a "lefty" PP (mirroring the "righty" first PP). Little down low in Stastny's role, Connor in the slot in Scheifele's role, Perreault on the left wall (Wheeler's) role, Ehlers on the right half wall (Laine) and Morrissey up top (Buff).