From the article: McCarthy has put considerable preparation into the opener, including working against the Eagles’ plays during training camp and piping in crowd noise to the
practice field even more during camp than they have in the past.
If he really wanted to give the players the experience of being at an Eagles game he should have hired Packers fans to act like Eagles fans.
Throwing batteries or other small heavy objects at the players. Yelling out curse words. Throwing cups of beer at them. Etc.