like wpr noted, dropped passes in addition to a slow start and Rodgers throwing a smidge high were indications of SOME nerves which are only to be expected.
However, experience in a Super Bowl is relatively overrated as we saw. You still play 60 minutes of football regardless, both teams have been on very big stages like the A/NFC Champ games, and the Packers have been in do-or-die mode for 6 games now.